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Effects of concentrations of cyanocobalamin in the gestation diet on some criteria of vitamin B₁₂ metabolism in first-parity sows^1,2

F. Simard^*,, F. Guay^*, C. L. Girard, A. Giguère, J.-P. Laforest^* and J. J. Matte^,3

^* Département des Sciences Animales, Université Laval, Québec, Québec, Canada G1K 7P4; and Maple Leaf Animal Nutrition, Lévis, Québec G6W 5M6, Canada; and Agriculture and Agri-Food Canada, Dairy and Swine Research and Development Centre, Sherbrooke, Québec, Canada J1M 1Z3

	Abstract

Top Abstract INTRODUCTION MATERIALS AND METHODS RESULTS AND DISCUSSION LITERATURE CITED

 
In swine nutrition, little is known about the role of vitamin B₁₂ in the reproductive processes. The current study was undertaken to obtain information on the dose-response pattern of different metabolic criteria related to the homeostasis of vitamin B₁₂ and homocysteine in gestating sows receiving various concentrations of dietary vitamin B₁₂ (cyanocobalamin). Homocysteine is a detrimental intermediate metabolite of the vitamin B₁₂-dependent remethylation pathway of Met. Forty nulliparous (Large White x Landrace) sows were randomly assigned during gestation to dietary treatments containing 5 concentrations of cyanocobalamin (0, 20, 100, 200, or 400 µg/kg). During lactation, a diet containing 25 µg of cyanocobalamin/kg (as-fed) was given to all sows. During gestation, plasma vitamin B₁₂ increased as concentrations of dietary cyanocobalamin increased (linear and quadratic, P < 0.01) and the effect persisted during lactation (21 d postpartum) both in plasma (linear and quadratic, P < 0.05) and the liver (linear and quadratic, P < 0.04). Plasma homocysteine decreased with concentrations of cyanocobalamin provided to sows during gestation (linear, quadratic, and cubic, P < 0.01). At parturition, vitamin B₁₂ in colostrum increased as concentrations of cyanocobalamin increased (linear and quadratic, P < 0.01), but the treatment effect persisted (linear, P = 0.01) only up to 1 d postfarrowing. However, in piglets there was no treatment effect (P = 0.59) on plasma vitamin B₁₂ before colostrum intake, but a linear effect of concentrations of cyanocobalamin (P = 0.04) was observed 1 d later. Plasma homocysteine in piglets during lactation decreased with increasing concentrations of cyanocobalamin given to sows in gestation (linear and quadratic, P < 0.01). Based on a broken-line regression model, the concentrations of dietary cyanocobalamin that maximized plasma vitamin B₁₂ and minimized plasma homocysteine of sows during gestation were estimated to be 164 and 93 µg/kg, respectively. The maximal residual responses in sows and piglets during lactation were observed with treatments of 100 or 200 µg of cyanocobalamin/kg. The dietary cyanocobalamin concentration necessary to optimize the response of these metabolic criteria remains to be refined within lower and narrower ranges of cyanocobalamin concentrations (i.e., <200 mg/kg). Moreover, the biological significance of such concentrations of cyanocobalamin needs to be validated with performance criteria by using greater numbers of animals during several parities.

Key Words: gestation • gilt • homocysteine • milk • piglet • vitamin B₁₂

	INTRODUCTION

Top Abstract INTRODUCTION MATERIALS AND METHODS RESULTS AND DISCUSSION LITERATURE CITED

 
Vitamin B₁₂ was the last vitamin to be identified in the late 1940s. It acts primarily through 2 important metabolic pathways: as an enzymatic cofactor in the remethylation of Met from homocysteine and 5-methyl-tetrahydrofolate, and also in the methylmalonyl-CoA mutase pathway. Vitamin B₁₂ is particularly important in tissues with high rates of cell turnover (Le Grusse and Watier, 1993; McDowell, 2000).

In swine nutrition, little is known about the role of vitamin B₁₂ in reproduction. Moreover, the information used to estimate the requirement is outdated (Cunha et al., 1944; Anderson and Hogan, 1950; Teague and Grifo, 1966b). However, it was the only information available to the NRC (1998) and Agricultural Research Council (1981) to estimate the requirements as being 15 µg/kg. In this respect, the statement made by Agricultural Research Council (1981) is quite evocative: "The proposed figure of 15 µg·kg^–1 of dietary DM must be considered very tentative and may need to be increased tenfold or more . . ." Recently, it was reported that plasma vitamin B₁₂ was approximately 2-fold lower in gilts than in multiparous sows (Guay et al., 2002a) and could be a limiting factor for the action of folates on the uterus and embryo during the first pregnancy (Matte et al., 2006a). Moreover, considering that the total vitamin B₁₂ content in uterine horns at 15 d of gestation represents between 180 and 300% of the total content in plasma (Guay et al., 2002b), vitamin B₁₂ requirements for reproduction might be especially important during early gestation. In addition, Guay et al. (2002b) showed that a supplement of 160 (vs. 20) µg/kg of cyanocobalamin was an effective tool for increasing the plasma vitamin B₁₂ of sows in early pregnancy.

Therefore, the current study was undertaken to provide updated information on the response pattern of different criteria related to homeostasis of vitamin B₁₂ and homocysteine in first-parity sows fed various concentrations of cyanocobalamin.

	MATERIALS AND METHODS

Top Abstract INTRODUCTION MATERIALS AND METHODS RESULTS AND DISCUSSION LITERATURE CITED

 
Animals

All animals were cared for and slaughtered according to the recommended code of practice of Agriculture Canada (1993). The procedure, which followed the guidelines of the Canadian Council on Animal Care (1993), was approved by the local Institutional Animal Care Committee.

Forty Large White-Landrace prepubertal gilts (average BW, 109.5 ± 1.4 kg) were transported to the experimental unit and grouped 2 to 3 per pen (1.5 x 2.5 m), and pens were located next to a boar to stimulate estrus. Gilts were fed 3.0 kg/d of a diet without any supplemental vitamin B₁₂ (Table 1). Eight blocks of 5 animals were formed according to their total circulating vitamin B₁₂ in plasma, which was based on plasma vitamin B₁₂ concentration and an estimated plasma volume of 4% of BW (Matte and Girard, 1996). Estrus was detected twice a day by introducing a boar into the pen between 0800 and 0900 and from 1600 to 1700. At the first pubertal estrus (average BW of 121.8 ± 1.4 kg), gilts were placed in individual stalls (0.6 x 2.2 m) and fed 2.25 kg of the diet/d (Table 1). Sows were randomly assigned within each block to 5 dietary treatments to provide 0, 20, 100, 200, or 400 µg of cyanocobalamin (Sigma-Aldrich Inc., St. Louis, MO) per kilogram of diet (as-fed) by top-dressing with a premix. At the third estrus, gilts were inseminated twice with 85 mL of semen (3 x 10⁹ live sperm cells from pooled semen of 3 Duroc boars) provided by a local AI center (CIPQ Inc., St-Lambert, Québec, Canada). When estrus was first detected in the morning, gilts were inseminated twice, at 8 and 24 h later, and when estrus was first detected in the afternoon, the 2 inseminations were done 16 and 24 h later. The day of the second insemination was considered as d 0 of gestation.

Sows were weighed upon their arrival at the Research Centre, at first pubertal estrus (assignment of treatments), insemination, d 110 of gestation, and weaning. Piglets were weighed on the day of farrowing (d 0) and on d 1, 7, 14, and 21 (weaning) of lactation. Before weighing, all piglets were separated from their mother for 1 h, which is slightly more than the normal natural interval between 2 suckling episodes (Pond and Maner, 1984b), to standardize the effect of previous milk intake on BW and plasma metabolite concentrations. After weaning, during the nursery period, feed and water were removed for 8 h before weighing and blood sampling. Sows were slaughtered at the end of the lactation period for determination of hepatic vitamin B₁₂ concentrations.

Samplings and Analytical Measurements

Blood and Tissue Collection. Blood was collected in disposable evacuated tubes containing EDTA as the anticoagulant (Becton Dickenson, Franklin Lakes, NJ), centrifuged for 10 min (1,800 x g), and the plasma was frozen at –20°C. After a fasting period of at least 16 h, samplings were done at arrival, when the sows were assigned to treatments (first pubertal estrus), at the time of insemination (third postpubertal estrus, d 0 of gestation), and on d 15, 30, 60, 90, and 110 of gestation. During lactation, blood samples were collected from sows and from 3 piglets per litter on d 1, 7, 14, and 21 after farrowing. However, for piglets, the fasting period was 1 h, which corresponded to the time during which all piglets were separated from their mother for the weighing procedure. All blood samples were collected at the same time of the day (0830 to 1000) and used to determine plasma concentrations of vitamin B₁₂, homocysteine, and Cys. Milk samples were also collected on d 0 (colostrum, before the first suckling), 1, 7, 14, and 21 of lactation to measure vitamin B₁₂ concentrations. Samples were obtained by milking 3 glands on each side of the mammary gland after an i.v. injection of 0.5 mL of oxytocin (20 IU/mL, P.V.U.) in the marginal ear vein (Farmer et al., 1999). For each sampling time, all samples taken from each sow were mixed and stored at –20°C until analysis. After slaughter (weaning), liver samples were collected, frozen immediately on dry ice, and stored at –75°C until analysis for vitamin B₁₂.

Analytical Measurements. Concentrations of plasma vitamin B₁₂ were measured by radioassay [Quantaphase II, B₁₂ Radioassay, Bio-Rad Laboratories (Canada) Ltd., Montreal, Québec, Canada] following a procedure validated by Bilodeau et al. (1989) and Guay et al. (2002a); inter- and intraassay CV were 6.1%. Concentrations of total plasma homocysteine and Cys were determined by using a method adapted from the methods of Gilfix et al. (1997). A 100-µL quantity of plasma were mixed with 10 µL of 10% Tris (2-carboxyl-ethyl)phosphine and incubated at room temperature for 30 min. Then, 100 µL of 10% perchloric acid containing 1 mM disodium EDTA was added. The mixture was centrifuged for 10 min at 11,000 x g, and 100 µL of the supernatant was transferred to a tube containing 20 µL of NaOH (1.55 M), 250 µL of a borate buffer (0.125 M) containing 4 mM EDTA (pH 9.5), and 100 µL of ammonium 7-fluorobenzo-2-oxa-1,3-diazole-4-sulfonate (0.1%). After mixing, the solution was incubated for 1 h at 60°C, and then left at room temperature to cool. A 20-µL quantity of this solution was injected into an HPLC system, using the following components: a solvent delivery system (Model Prostar 210, Varian, Walnut Creek, CA) equipped with a column (Microsorb-MV 100-5 C18, 250 x 4.6 mm, Varian), an autosampler with a 20-µL injection loop (model 9300, Varian), and a fluorometric detection system (model LC240, Perkin-Elmer, Woodbridge, Ontario, Canada) adjusted at 750 and 375 nm for emission and excitation. The system was controlled by a computing program (Star Workstation Version 5, Varian). The mobile phase was 6% acetonitrile containing 50 mM H₂SO₄ and the flow rate was adjusted to 1 mL/min. Standards were prepared from stock solutions at 13.5 and 12.1 mg/mL of DL-homocysteine and L-Cys (Sigma-Aldrich), respectively. For homocysteine, the intra- and interassay CV were 0.8% (n = 8) and 6.1% (n = 48), respectively, and the recovery was 99.8% (n = 6). For Cys, the intra- and interassay CV were 2.5% (n = 13) and 5.6% (n = 48), respectively, and the recovery was 99.5% (n = 8).

Concentration of milk vitamin B₁₂ was measured by sample preparation, as suggested by Gregory (1954). A 1-mL quantity of milk was mixed with 1 mL of 0.1 M sodium acetate buffer (pH 4.6) and was incubated in a water bath at 60°C for 5 min. One milliliter of a papain (Sigma p-3250, Sigma-Aldrich) solution (50 mg/mL), and 37 µL of 1% NaCN were added and incubated in a water bath at 60°C for 1 h. The mixture was then autoclaved at 121°C for 10 min and cooled with ice. The pH was adjusted to 4.6 by using 100 and 200 µL of 0.2 N HCl for colostrum and milk, respectively, and the mixture was centrifuged at 1,800 x g for 11 min. The supernatant was collected, and the pH was adjusted to 6.5 with 300 and 350 µL of 0.1 N NaOH for colostrum and milk, respectively. This hydrolysate was centrifuged again at 11,000 x g for 5 min. Milk hydrolysates were used directly and colostrum hydrolysates were diluted to 1:5 (vol/vol) for the radioassay procedure, as described previously for plasma. The intra- and interassay CV were 3.7% (n = 24) and 2.5% (n = 24), respectively.

Liver concentrations of vitamin B₁₂ were measured by using a sample preparation adapted from that described for milk. A 250-mg quantity of liver was homogenized in a glass grinder tube with 4 mL of sodium acetate buffer (pH 4.6). One milliliter of this homogenate was incubated in a water bath at 60°C for 5 min. One milliliter of a papain (Sigma p-3250, Sigma-Aldrich) solution (50 mg/mL) and 74 µL of 1% NaCN were added and incubated in a water bath at 60°C for 1 h. The mixture was then autoclaved at 121°C for 10 min and cooled with ice. The pH was adjusted to 4.6 by using 100 µL of 0.2 N HCl, and the mixture was centrifuged at 1,800 x g for 13 min. The supernatant was collected, and the pH was adjusted to 6.5 with 300 µL of 0.1 N NaOH. This hydrolysate was centrifuged again at 11,000 x g for 5 min. The supernatant was diluted 1:8 (vol/vol) and used in a radioassay procedure as described previously for plasma. The intra- and interassay CV were 4.3% (n = 30) and 2.1% (n = 30), respectively.

Statistical Analyses

Data were analyzed by using PROC MIXED (SAS Inst. Inc, Cary, NC; Littell et al., 1996) as a randomized complete block design, with 5 treatments in 8 blocks. Polynomial contrasts (linear, quadratic, cubic, and quartic effects) were used to compare the dietary cyanocobalamin concentrations (0, 20, 100, 200, or 400 µg/kg). For repeated measurements such as BW, plasma vitamin B₁₂, homocysteine, Cys, and milk vitamin B₁₂, the effects of stage of gestation and lactation (residual effects of the gestation treatments) and interactions with treatments were partitioned into independent polynomial contrasts. The spatial power covariance structure [SP(POW)] was used because the spacing of time intervals was unequal. A broken-line regression model was fit according to Robbins et al. (2006) to estimate an inflection point for dietary cyanocobalamin concentration (x-axis) when the response to treatments was linear and quadratic during gestation (i.e., only during the period when the treatments were applied).

	RESULTS AND DISCUSSION

Top Abstract INTRODUCTION MATERIALS AND METHODS RESULTS AND DISCUSSION LITERATURE CITED

 
Performance

Two sows had to be removed during the experiment because one did not show any signs of estrus and the other developed locomotion problems during the last month of gestation. No treatment effect (P = 0.28) was observed on BW changes during gestation or lactation. The average values were 148.2 ± 1.5, 208.6 ± 2.0, and 173.2 ± 2.2 kg at insemination, farrowing, and weaning, respectively.

There was a tendency for a treatment effect (quartic, P = 0.06) on litter size and weight at parturition (Table 2). At weaning, there was still a residual effect of the gestation treatments on litter size (quartic, P = 0.02) but not for the total litter weight (P = 0.61; Table 2). Although some treatment differences were shown to be statistically significant, the biological significance of those results should be interpreted with caution because the number of replications (n = 7 or 8) per treatment in the current study was less than the number required for a reliable interpretation of data on litter size (>30; Aaron and Hays, 2001). In the current study, we aimed to maximize the number of treatments for the best possible determination of a dose-response curve for several metabolic criteria associated with vitamin B₁₂ metabolism in prolific sows. Reproductive performance data were provided as an indication of the prolificacy of the first-litter sows used in the experiment (overall mean of 11.8 ± 0.4 total piglets born).

Plasma vitamin B₁₂ before initiation of treatments, 42 d before insemination, was similar (84.9 ± 3.6 pg/mL, P = 0.34) among treatments. In nonsupplemented sows, plasma concentrations of vitamin B₁₂ decreased by approximately 33% to reach a minimum at 30 d of gestation (57.6 ± 5.1 pg/mL), and returned to the initial concentration (90.1 ± 10.3 pg/mL) at the end of gestation. For sows that received supplements, plasma concentrations of vitamin B₁₂ increased rapidly between the initiation of treatment and insemination (126.2 ± 12.1, 170.2 ± 16.1, 243.1 ± 10.6, 234.6 ± 15.4 pg/mL in sows fed 20, 100, 200, or 400 µg/kg, respectively) and remained stable thereafter throughout gestation (treatment x stage of gestation, P = 0.01). Taking into account the average values for the whole gestation period, the response to vitamin B₁₂ supplementation was linear and quadratic for both plasma vitamin B₁₂ and homocysteine (P < 0.01; Figure 1), and the inflection point was estimated to be 164 µg/kg of cyanocobalamin. Plasma vitamin B₁₂ is recognized and often used as a reliable indicator of the overall vitamin B₁₂ status of the animal (Le Grusse et Watier, 1993; Combs, 1998). This is all the more likely in the present experiment because of the uniformity of the feeding regimen, timing of the blood sampling procedure, and fasting period. During lactation (although all sows received the same lactation diet with 25 µg of cyanocobalamin/kg), the effects of supplementation on plasma vitamin B₁₂ persisted (linear and quadratic, P = 0.05 and 0.01, respectively; Table 3). At the hepatic level (d 21 of lactation), the residual effects of the gestation treatments were similar to those observed for plasma values during lactation (linear and quadratic, P = 0.04 and 0.01, respectively; Table 3). This residual response is probably because the liver has the ability to store vitamin B₁₂. It is recognized as a reliable indicator of vitamin B₁₂ status and holds more than 50% of the body reserves of the vitamin, which are used up slowly (±1 yr) in most species (Le Grusse and Watier, 1993; Combs, 1998). In pigs, a slow hepatic release and metabolic utilization of vitamin B₁₂ have been also reported, specifically in reproducing sows (Frederick and Brisson, 1961). Nevertheless, recent data from our laboratory (Matte et al., 2006b) using growing pigs indicated that the hepatic content might be lower in swine (i.e., approximately 30% of the overall body content of vitamin B₁₂).

View larger version (10K): [in this window] [in a new window]   Figure 1. Average plasma vitamin B12 [effect of cyanocobalamin concentrations (linear and quadratic, P < 0.01)] and homocysteine concentrations [effect of cyanocobalamin concentrations (linear, quadratic, and cubic, P < 0.01)] for overall gestation (0, 15, 30, 60, and 110 d) according to dietary concentrations of cyanocobalamin fed to primiparous sows from 42 d before gestation until the end of gestation. Values are arithmetic means ± SEM; n = 7 or 8.

The average concentration of plasma homocysteine for the overall gestation period decreased with an increasing concentration of vitamin B₁₂ (linear, quadratic, and cubic, P < 0.01; Figure 1); the inflection point was estimated to be 93 µg/kg of cyanocobalamin. Homocysteine is an intermediary AA known for its deleterious effects on several aspects of metabolism, including abnormal embryonic and fetal development (Pietrzik and Brönstrup, 1997; DiSimone et al., 2004; Obeid and Herrmann, 2005). According to responses of both plasma homocysteine and vitamin B₁₂, the vitamin B₁₂ supplementation seems to have stimulated the vitamin B₁₂-dependent remethylation pathway of Met, which regenerates Met from homocysteine by using methyl groups provided by folic acid metabolism (Bässler, 1997). As in the present experiment, folic acid was incorporated into the feed at a concentration of 10 mg/kg, which was shown as the optimum to meet the metabolic needs of gestating sows (Matte and Girard, 1999); thus, it was unlikely a limiting factor for the potential action of vitamin B₁₂. The present hypothesis relating to the disposal of homocysteine through the remethylation pathway of Met was further supported by the fact that plasma Cys concentrations of sows during gestation were not affected (P = 0.23) by cyanocobalamin concentrations. Cysteine can also be synthesized from homocysteine through the transsulfuration pathway (Le Grusse et Watier, 1993; Combs, 1998). The average plasma Cys concentrations declined (stage of gestation, P < 0.01) from 249.8 ± 3.9 on d 0 to 235.9 ± 3.0, 237.7 ± 3.2, and 210.5 ± 3.5 µM on d 30, 90, and 110 of gestation, respectively. During lactation, no treatment effect of the dietary cyanocobalamin supplementation on plasma homocysteine was observed (P = 0.660), down from 23.8 ± 0.6 µM on d 1 to 12.6 ± 0.4 µM and 12.5 ± 0.6 µM on d 14 and 21, respectively (stage of lactation, P < 0.01). For plasma Cys, there was no treatment effect (P = 0.60) during lactation, but the average overall values decreased (stage of lactation, P < 0.01) from 261.1 ± 4.2 at parturition to 253.3 ± 4.7, 230.7 ± 4.4, and 219.4 ± 5.3 µM on d 7, 14, and 21 of lactation, respectively. The significance of those decreases of both homocysteine and Cys during lactation remains to be further investigated.

Transfer of Vitamin B₁₂ from Dam to Piglets

The vitamin B₁₂ concentration in colostrum was dependent (linear and quadratic, P < 0.01) on the concentrations of dietary cyanocobalamin given during gestation (Table 3). The maximum response observed at 200 µg/kg of cyanocobalamin was 114 and 69% greater than for sows in the 0 and 20 µg/kg treatments, respectively. By d 1 of lactation, the vitamin B₁₂ content in milk, compared with colostrum, had dropped by approximately 40% in all treatments (stage of lactation, P = 0.01), but a residual effect of the gestation treatments persisted (linear, P < 0.01). As lactation progressed, the residual effects of the gestation treatments disappeared (P = 0.34), and the overall vitamin B₁₂ concentrations in milk were 6.28 ± 0.47, 5.73 ± 0.38, and 5.79 ± 0.31 ng/mL at d 7, 14, and 21, respectively.

Plasma vitamin B₁₂ in piglets before ingestion of colostrum was not affected (P = 0.59) by treatments given to sows, and the mean value was 0.59 ± 0.05 ng/mL. Vitamin B₁₂ was measured in liver from a limited number of stillborn (d 0) piglets, which had no access to colostrum. Average concentration of liver vitamin B₁₂ was approximately 2-fold greater (209.7 ± 2.7 ng/g) for piglets from sows fed 200 (n = 2) or 400 µg/kg (n = 1) compared with those from sows fed 0 (81.3 ± 8.7 ng/g; n = 3) or 20 µg/kg of cyanocobalamin (162.1 ± 9.0 ng/g; n = 5) during gestation. According to the mean BW of those stillborn piglets at 1.2 kg and a liver weight of 3.1% of BW (Pond and Maner, 1984a), the total amount of vitamin B₁₂ in the liver of those piglets could be estimated to be 3, 6, and 7.8 µg with the 0, 20, and 200 to 400 µg/kg treatments, respectively. Those values are comparable with the 4.2-µg amount reported by Ford et al. (1975). The corresponding estimation for the total amount of vitamin B₁₂ in plasma of live newborn piglets (mean BW of 1.45 kg and plasma volume at 4% of BW) is negligible, at 0.035 µg. Therefore, although the liver values must be interpreted with caution, it is likely that a substantial amount of vitamin B₁₂ was transferred in utero and increased with the amount of dietary cyanocobalamin given to the sow during gestation. Such treatment responses are in agreement with those reported by Teague and Grifo (1966a), who used concentrations of cyanocobalamin at 0, 110, and 1,100 µg/kg of sow feed.

On d 1, after the ingestion of colostrum, the plasma vitamin B₁₂ concentrations in piglets increased substantially (P = 0.01) and were influenced by the amount of vitamin B₁₂ ingested by the sow during gestation (linear, P = 0.04; Table 3). From d 7 and as lactation progressed, the residual treatment effects disappeared and the mean plasma concentrations of vitamin B₁₂ decreased rapidly (stage of lactation, P = 0.01), with overall values of 0.74 ± 0.08, 0.38 ± 0.03, and 0.32 ± 0.02 ng/mL at d 7, 14, and 21, respectively.

These results indicate that colostrum is one of the important routes of vitamin B₁₂ transfer from the sow to newborn piglets, and it can be modulated by the dietary concentrations of cyanocobalamin given during gestation. In fact, assuming a colostrum intake per piglet of approximately 430 g (Devillers et al., 2004), the vitamin B₁₂ provision would vary between 3 and 4 µg during the day after parturition, and this vitamin B₁₂ source is likely to be highly bioavailable according to Ford et al. (1975) and Trugo et al. (1985). Such provision corresponds to 50 to 100% of the total amount of vitamin B₁₂ stored in the liver at birth, as estimated previously. Although, to our knowledge, such information on vitamin B₁₂ has never been reported for pigs, the importance of the colostral route of transfer from mother to offspring is not unique to vitamin B₁₂, because a similar process would occur for other vitamins, including folic acid (Barkow et al., 2001b) and vitamins A and E (Håkansson et al., 2001).

Homocysteine Homeostasis in Piglets

There was a marked residual effect of the treatments given to dams during gestation on plasma homocysteine concentrations of the piglets (linear and quadratic, P < 0.01), which persisted throughout lactation (Figure 2). Most of the homocysteine reduction was seen among the cyanocobalamin treatments of 0, 20, or 100 µg/kg. At 35 d of age, there was no more residual effect of treatments (P = 0.31) on plasma homocysteine concentrations (13.0 ± 0.5 µM; n = 19). Those residual treatment effects on plasma homocysteine of piglets during lactation indicate that the pre- and postnatal transfer of vitamin B₁₂, although not apparent (except for d 1) in the plasma concentrations of vitamin B₁₂ of piglets, were important enough to influence the remethylation pathway of Met during early lactation. This result is further supported by the fact that plasma Cys concentrations in piglets, which are related to the transsulfuration pathway for disposal of homocysteine, were not affected (P = 0.10) by a residual effect of the dietary cyanocobalamin treatments to dams during gestation. Aside from those treatment effects, the overall variations of the general profile of both plasma homocysteine and Cys in piglets deserve to be mentioned. Indeed, concentrations of homocysteine at birth were approximately 10 times lower than the corresponding values for the dam, and they increased sharply, on average from 2.6 ± 0.1 µM at d 0 to 28.8 ± 1.1 µM at d 21 (stage of lactation, P = 0.01). This homocysteine is likely to originate from the metabolism of the piglet, because measurements of this metabolite in milk samples collected throughout lactation revealed that it was absent from the mammary secretions. For Cys, there was also an overall marked increase (stage of lactation, P < 0.01) during the same period, with values of 54.0 ± 2.1, 74.9 ± 2.5, 133.6 ± 2.7, 181.7 ± 2.6, and 186.8 ± 2.6 µM at d 0, 1, 7, 14, and 21, respectively. These results are in agreement with recent data from Ballance and House (2005), who also showed similar changes in plasma homocysteine and Cys along with a substantial increase in the transsulfuration pathway enzyme activities (cystathione-ß synthase and cystathionine--lyase) and a drastic decrease in Met synthase activity between birth and 26 d of age. This early increase in efficiency of the transsulfuration pathway may not be sufficient to deal with the huge and sudden production of homocysteine from the piglet metabolism. The transmethylation pathway (Met synthase), although declining with age, will have a considerable impact on homocysteine disposal as long as the enzyme is fully functional, with adequate provision of folic acid and vitamin B₁₂. In the current study, although the maximum residual effect of the gestation treatments (100 µg/kg) represented a decrease in plasma homocysteine of at least 34% (8 µM) and 21% (3 µM) as compared with piglets from sows fed 0 and 20 µg/kg of cyanocobalamin, respectively, those minimal values of homocysteine remained high as compared with values in other species (<10 µM) such as dairy cows (Girard et al., 2005), rats (Sarwar et al., 2000), mice (Hofmann et al., 2001), cats (Ruaux et al., 2001), and humans (Pietrzik and Brönstrup, 1997). These differences among species deserved to be better understood.

View larger version (10K): [in this window] [in a new window]   Figure 2. Change in plasma homocysteine concentrations [effect of cyanocobalamin concentrations (linear and quadratic, P < 0.01)] according to age of piglet and to dietary concentrations of cyanocobalamin fed to their mothers from 42 d before gestation until the end of gestation. Values are arithmetic means per litter ± SEM; n = 7, or 8.

	Footnotes

 
¹ The authors would like to thank M. Guillette, M. Turcotte, and D. Morissette for technical assistance and animal care, J. D. House (University of Manitoba) for his comments on the manuscript, and M. Vignola (Maple Leaf Animal Nutrition) for his professional support.

² Research supported by Fédération des producteurs de porcs du Québec, Centre d’Insémination Porcine du Québec Inc., Adisseo Animal Nutrition Inc., Genex Swine Group Inc., and the Matching Investment Initiative of Agriculture and Agri-Food Canada.

³ Corresponding author: mattej{at}agr.gc.ca

Received for publication August 1, 2006. Accepted for publication August 9, 2007.

	LITERATURE CITED

Top Abstract INTRODUCTION MATERIALS AND METHODS RESULTS AND DISCUSSION LITERATURE CITED

 


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Agriculture Canada. 1993. Recommended code of practice for care and handling of pigs. Publ. no. 1771E. Agriculture Canada, Ottawa, Ontario, Canada.

Agricultural Research Council. 1981. The Nutrient Requirements of Pigs. Agric. Res. Counc., Commonwealth Agricultural Bureaux, Slough, UK.

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Ballance, D. M., and J. D. House. 2005. Development of the enzymes of homocysteine metabolism from birth through weaning in the pig. J. Anim. Sci. 83(Suppl. 1):160. (Abstr.)[Abstract/Free Full Text]

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