| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
ANIMAL NUTRITION |
* Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, N1G 2W1 Canada and
and
Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand
3 Correspondence—phone: 519-824-4120, ext. 56477; fax: 519-836-9873; e-mail: cdelange{at}uoguelph.ca.
Abstract
Two experiments were conducted to determine independent effects of BW and DE intake on body composition and the partitioning of retained body energy between lipid and protein in pigs with high lean tissue growth potentials and when energy intake limited whole-body protein deposition. In a preliminary N-balance experiment involving 20 entire male pigs at either 30 or 100 kg BW, it was established that whole-body protein deposition increased linearly (P < 0.05) with DE intake at both BW. These results indicate that DE intake controlled whole-body protein deposition and that these pigs did not achieve their maximum whole-body protein deposition when fed semi-ad libitum. In the main serial slaughter experiment, 56 pigs, with a BW of 15 kg, were assigned to one of four DE intake schemes and slaughtered at 40, 65, 90, or 115 kg BW. Within DE intake schemes, DE intake was increased linearly (P < 0.05) with BW, allowing for an assessment of effects of DE intake and slaughter BW on chemical and physical body composition (carcass, viscera, blood). Between 15 and 90 kg BW, average DE intake of 16.1, 20.9, 25.2, and 28.8 MJ/d supported average BW gains of 502, 731, 899, and 951 g/d, respectively. The proportion of whole-body protein present in the carcass increased with BW and decreased with DE intake (P < 0.05), whereas the distribution of whole-body lipid between carcass and viscera was not influenced by BW and DE intake. A mathematical relationship was developed to determine the relationship between DE intake at slaughter (MJ/d) and chemical body composition in these pigs: whole-body lipid-to-protein ratio = 1.236 - 0.056 x (DE intake) + 0.0013 x (DE intake)2, r2 = 0.71. The data suggests that absolute DE intake alone was an adequate predictor of chemical body composition in this population of entire male pigs over the BW and DE intake ranges that were evaluated, simplifying the characterization of this aspect of nutrition partitioning for growth in different pig populations.
Key Words: Body Weight • Digestible Energy • Energy Partitioning • Growing Pig • Protein Deposition
This article has been cited by other articles:
|
|
 |
|
  T. F. Oresanya, A. D. Beaulieu, and J. F. Patience Investigations of energy metabolism in weanling barrows: The interaction of dietary energy concentration and daily feed (energy) intake J Anim Sci, February 1, 2008; 86(2): 348 - 363. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. P. Schinckel, D. C. Mahan, T. G. Wiseman, and M. E. Einstein Growth of protein, moisture, lipid, and ash of two genetic lines of barrows and gilts from twenty to one hundred twenty-five kilograms of body weight J Anim Sci, February 1, 2008; 86(2): 460 - 471. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. R. Schwab, T. J. Baas, K. J. Stalder, and J. W. Mabry Deposition rates and accretion patterns of intramuscular fat, loin muscle area, and backfat of Duroc pigs sired by boars from two time periods J Anim Sci, June 1, 2007; 85(6): 1540 - 1546. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
R. F. Bertolo, S. Moehn, P. B. Pencharz, and R. O. Ball Estimate of the variability of the lysine requirement of growing pigs using the indicator amino acid oxidation technique J Anim Sci, November 1, 2005; 83(11): 2535 - 2542. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
