Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-30T18:56:22.075Z Has data issue: false hasContentIssue false
  • English
  • Français

Influence of energy and protein concentration in the diet on the performance of growing pigs 3. Response to differences in levels of both energy and protein

Published online by Cambridge University Press:  02 September 2010

R. Cooke ,
G. A. Lodge  and
D. Lewis
R. Cooke
Affiliation:
University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leicestershire
G. A. Lodge
Affiliation:
University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leicestershire
D. Lewis
Affiliation:
University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leicestershire
Get access

Summary

One hundred and twenty eight gilts by Landrace sires out of Large White × Landrace females were allocated on the basis of litter relation-ship and initial weight to 16 treatments involving the individual feeding of four dietary protein levels (approximately 15%, 18%, 21% and 24% CP) at each of four energy levels (2830, 3100, 3375 and 3585 kcal DE/kg air-dry feed). Amino acid balance (as% of total CP) was maintained relatively constant, using synthetic lysine and methionine where necessary. Growth performance was measured over a live-weight range of 23 kg to 59 kg, at which latter weight the pigs were slaughtered for carcass evaluation by dissection of the middle ‘joint’ from a half carcass. Linear carcass measure-ments were also taken. There was a significant energy × protein interaction only for killing-out percentage; for all other measures the main effects could be assessed independently. Increase in dietary energy value gave linear increase in growth rate (GR) and improve-ment in efficiency of feed conversion (EFC), accompanied by linear decrease in lean percentage and increase in fat percentage. Increase in dietary protein level gave an increase in GR and improvement in EFC with the first increment (from 15% to 18% CP), but depressions in both these characteristics with the final increment (from 21% to 24% CP). Lean percentage increased and fat percentage decreased with the first protein increment, with no further significant changes. Calculation of daily rates of tissue deposition indicated that maximum rate and efficiency of fat-free carcass gain could be attained with the second lowest energy and protein levels tested (i.e. 3106 kcal DE/kg and 18·2% CP).

Type
Research Article
Information
Animal Production , Volume 14 , Issue 2 , April 1972 , pp. 219 - 228
Copyright
Copyright © British Society of Animal Science 1972

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Barber, R. S., Braude, R., Chamberlain, A. G., Mitchell, K. G., Cuthbertson, A. and Pomeroy, R. W. 1964. Nitrogen metabolism and body composition in growing pigs. Anim. Prod. 6: 258 (Abstr.).Google Scholar
Barber, R. S., Braude, R., Mitchell, K. G., Newport, M. J. and Cuthbertson, A. 1968. Nitrogen metabolism and body composition of growing pigs (2nd communication). Anim. Prod. 10: 238 (Abstr.).Google Scholar
Blair, R., Dent, J. B., English, P. R. and Raeburn, J. R. 1969a. Protein, lysine and feed intake effects on pig growth. 1. Main effects. J. agric. Sci., Camb. 72: 379–400.Google Scholar
Blair, R., Dent, J. B., English, P. R. and Raeburn, J. R. 1969b. Protein, lysine and feed intake effects on pig growth. 2. Effects on carcass composition and quality. J. agric. Sci., Camb. 73: 395–415.Google Scholar
Braude, R., Mitchell, K. G., Myres, A. W. and Cuthbertson, A. 1969. Nitrogen metabolism and body composition of growing pigs. Anim. Prod. 11: 292 (Abstr.).Google Scholar
Chamberlain, A. G. 1968. The effects of dietary fish meal level on the performance of growing pigs. Anim. Prod. 10: 236 (Abstr.).Google Scholar
Chamberlain, A. G. and Cooke, B. C. 1970. The nutritive value of separated milk for pigs. II. The effects of different amounts on performance to 90 kg live weight. Anim. Prod. 12: 125–137.Google Scholar
Chamberlain, A. G. and Lucas, I. A. M. 1966. Barley meal and separated milk diets for growing pigs. Anim. Prod. 8: 361 (Abstr.).Google Scholar
Cooke, R. 1969. Protein Nutrition of the Growing Pig. Ph.D. Thesis, Univ. Nottingham.Google Scholar
Cooke, R., Lodge, G. A. and Lewis, D. 1972. Influence of energy and protein concentra-tion in the diet on the performance of growing pigs. 1. Response to protein intake on a high-energy diet. Aram. Prod. 14: 35–46.Google Scholar
Joblin, A. D. H. 1966. The estimation of carcass composition of bacon weight pigs. 3. The use of butcher's dissections and full dissections of sample joints. N.Z. Jl agric. Res. 9: 241–251.CrossRefGoogle Scholar
Lodge, G. A., Cundy, M. E., Cooke, R. and Lewis, D. 1972. Influence of energy and protein concentration in the diet on the performance of growing pigs. 2. Differing nutrient density at a constant energy:protein ratio. Anim. trod. 14: 47–55.Google Scholar