| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
,4
* Department of Animal Sciences, University of Missouri, Columbia 65211 and
and
Pig Improvement Co., Franklin, KY 42135
5 Correspondence: Lab 111 Animal Science Research.
This study was conducted to determine the effect of reduced lactation length and supplemental milk replacer (MR) during high ambient temperatures. Thirty nine primiparous and 100 multiparous sows (PIC, Franklin, KY, C-22) were used in a 2 x 2 x 2 factorial arrangement of treatments. Treatments consisted of two lactation room temperatures (21°C [TN] and 32°C [HOT]), two lactation lengths (14 or 19 d), and two parity groups (primiparous, multiparous). Pigs were either: 1) sow-reared to 19 d or 2) sow-reared to 14 d, and then reared to 19 d with MR after sow removal. All sows were fed the same diet (1.07% lysine, 3,366 kcal of ME/kg). Sows were weighed and ultrasound for backfat thickness (BF) and longissimus muscle area (LMA) within 6 h after farrowing and at the time of sow removal (d 14 or 19). Pigs were individually weighed at weaning (d 19) and after a 47-d nursery period (d 66). Heat stress increased sow weight loss (-13.35 kg, P < 0.01) and decreased sow feed intake (4.63 kg/d, P < 0.01) during lactation compared with sows in TN (+4.5 kg and 7.5 kg/d, respectively). Early weaning (d 14) during heat stress decreased maternal weight loss (-10.1 vs. -16.6 kg, P < 0.01). Primiparous sows lost more BF in both environments (-2.60 vs. -1.56 mm, P < 0.05), and both parity groups lost more BF (-3.35 vs. -2.3 mm, P < 0.10) and LMA (-1.82 vs. -0.77 cm2, P < 0.05) when lactating for 19 d in the HOT environment than those lactating for 14 d. Pigs nursing primiparous and multiparous sows in the HOT environment and provided MR had heavier individual 19-d weights (7.37 and 8.12 kg/pig, respectively) than those nursing to 19 d (5.57 and 6.04 kg/pig, P < 0.01). Milk replacer decreased the difference normally observed in 19-d weights between primiparous and multiparous sow-reared pigs in TN. Pigs fed MR in both environments and nursing multiparous sows had improved weight gains in the nursery compared with pigs nursing sows to 19 d (428 vs. 406 g/d, respectively; P < 0.01), or reared by primiparous sows (444 vs. 390 g/d, respectively; P < 0.01). Sow weaning on d 14 in the HOT environment decreased the wean-to-estrus interval in primiparous sows (22.8 vs. 9.2 d, P < 0.10). This study shows the benefit of early weaning in combination with milk replacer to preserve the sow and to restore pig weaning weights and nursery end weights under heat stress.
Key Words: Heat Stress • Lactation • Milk Composition • Piglet Feeding • Supplementary Feeding
This article has been cited by other articles:
|
|
 |
|
  J. D. Crenshaw, R. D. Boyd, J. M. Campbell, L. E. Russell, R. L. Moser, and M. E. Wilson Lactation feed disappearance and weaning to estrus interval for sows fed spray-dried plasma J Anim Sci, December 1, 2007; 85(12): 3442 - 3453. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 N. K. Gabler, J. D. Spencer, D. M. Webel, and M. E. Spurlock In Utero and Postnatal Exposure to Long Chain (n-3) PUFA Enhances Intestinal Glucose Absorption and Energy Stores in Weanling Pigs J. Nutr., November 1, 2007; 137(11): 2351 - 2358. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. J. Peng, S. A. Somes, and D. W. Rozeboom Effect of system of feeding and watering on performance of lactating sows J Anim Sci, March 1, 2007; 85(3): 853 - 860. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
