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Effects of dietary protein content and food intake on carcass characteristics and organ weights of growing Iberian pigs

Published online by Cambridge University Press:  18 August 2016

R. Nieto
Affiliation:
Unidad de Nutrición Animal, Estación Experimental del Zaidín (CSIC), Camino del Jueves s/n, 18100 Armilla, Granada, Spain
L. Lara
Affiliation:
Unidad de Nutrición Animal, Estación Experimental del Zaidín (CSIC), Camino del Jueves s/n, 18100 Armilla, Granada, Spain
M. A. García
Affiliation:
Unidad de Nutrición Animal, Estación Experimental del Zaidín (CSIC), Camino del Jueves s/n, 18100 Armilla, Granada, Spain
M. A. Vílchez
Affiliation:
Sucesores de Miguel Vílchez Riquelme SA., Granada, Spain
J. F. Aguilera*
Affiliation:
Unidad de Nutrición Animal, Estación Experimental del Zaidín (CSIC), Camino del Jueves s/n, 18100 Armilla, Granada, Spain
*
Corresponding author. E-mail : [email protected]
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Abstract

The effects of dietary protein content and level of feeding on carcass characteristics and organs weight were evaluated in 72 male castrated Iberian pigs growing from 15 to 50 kg live weight. Animals were offered six diets providing 223, 192, 175, 156, 129 and 101 g crude ideal protein (CP) (N × 6·25) per kg dry matter (DM) and 14·64, 14·14, 14·37, 14·80, 15·36 and 15·53 MJ metabolizable energy (ME) per kg DM, respectively. Each diet was offered at three levels of feeding : 0·60, 0·80 and 0·95 × ad libitum intake. Mean values of protein, fat, ash and water contents in the carcass determined at 50 kg live weight were 130, 378, 28·2 and 458 g/kg, respectively, with a small but significant effect of CP content of the diet on carcass composition (P <0·001 to P <0·01) favouring both protein and fat content on decreasing dietary protein level. Protein deposition (PD) in the eviscerated carcass reached a maximum value when the diet containing 129 g CP per kg DM was offered (54·6 g/day at the highest feeding level). Nitrogen (N) retention in the carcass represented 70·9% of whole-body N retention and the efficiency of this process (carcass N retention : N intake) increased with declining dietary protein content (P <0·001). Carcass energy retention increased significantly with decreasing dietary CP content (P <0·001) and with feeding level (P <0·001). Raising energy intake resulted in a significant increase on total weight of viscera as proportion of empty body weight (P <0·001). Decreasing the CP content in the diet resulted in a lower proportional shoulder weight (P <0·01) meanwhile the proportion of ham decreased significantly (P <0·05) with increase in feeding level. The proportionate weights of dissectable fat in the shoulder and of intermuscular and subcutaneous fat in the ham increased significantly (P <0·05 and P <0·001) in response to decreasing dietary CP content meanwhile only ham intermuscular fat content increased with feeding level (P <0·001). Thus, decreasing dietary protein concentration from well in excess of requirements and increasing energy intake enhance N and fat retention in the carcass but also increases intermuscular fat content in the ham of the Iberian pig with possible implications for meat quality.

Type
Growth, development and meat science
Copyright
Copyright © British Society of Animal Science 2003

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References

Agricultural Research Council. 1981. The nutrient requirements of pigs. Commonwealth Agricultural Bureaux, Slough, England.Google Scholar
Association of Official Analytical Chemists. 1975. Official methods of analysis of the Association of Official Analytical Chemists, 12th edition. AOAC, Washington, DC.Google Scholar
Campbell, R. G. and Taverner, M.R. 1988. Genotype and sex effects on the relationship between energy intake and protein deposition in growing pigs. Journal of Animal Science 66: 676686.Google Scholar
Campbell, R. G., Taverner, M.R. and Curic, D.M. 1985. The influence of feeding level on the protein requirements of pigs between 20 and 45 kg live weight. Animal Production 40: 489496.Google Scholar
Cooke, R., Lodge, G.A. and Lewis, D. 1972a. Influence of energy and protein concentration in the diet on the performance of growing pigs. 1. Response to protein intake on a high-energy diet. Animal Production 14: 3546.Google Scholar
Cooke, R., Lodge, G.A. and Lewis, D. 1972b. 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. Animal Production 14: 219228.Google Scholar
Fuller, M. F., Franklin, M.F., McWilliam, R. and Pennie, K. 1995. The responses of growing pigs, of different sex and genotype, to dietary energy and protein. Animal Science 60: 291298.Google Scholar
Koong, L. J., Nienaber, J.A. and Mersmann, H.J. 1983. Effects of plane of nutrition on organ size and fasting heat production in genetically obese and lean pigs. Journal of Nutrition 113: 16261631.Google Scholar
Koong, L. J., Nienaber, J.A., Pekas, J.C. and Yen, J.T. 1982. Effects of plane of nutrition on organ size and fasting heat production in pigs. Journal of Nutrition 112: 16381642.Google Scholar
López-Bote|C. J. 1998. Sustained utilization of the Iberian pig breed. Meat Science 49: (suppl. 1) S17S27.Google Scholar
National Research Council. 1998. Nutrient requirements of swine. National Academy Press, Washington, DC.Google Scholar
Nieto, R., Miranda, A., García, M. A. and Aguilera, J.F. 2002. The effect of dietary protein content and feeding level on the rate of protein deposition and energy utilization in growing Iberian pigs from 15 to 50 kg body weight. British Journal of Nutrition 88: 3949.Google Scholar
Noblet, J., Karege, C., Dubois, S. and Milgen, J. van. 1999. Metabolic utilization of energy and maintenance requirements in growing pigs: effects of sex and genotype. Journal of Animal Science 77: 12081216.Google Scholar
Rao, D. S. and McCracken, K.J. 1992. Energy : protein interactions in growing boars of high genetic potential for lean growth. 1. Effects on growth, carcass characteristics and organ weights. Animal Production 54: 7582.Google Scholar
Rivera-Ferre, M. G. 2003. La renovación proteica corporal en el cerdo ibérico en crecimiento. Efecto de alteraciones en el aporte y composición de la proteína de la dieta. [Body protein turnover in the growing Iberian pig. Effect of changes in the amount and composition of the dietary protein.] Ph.D. thesis, University of Córdoba.Google Scholar
Statistical Analysis Systems Institute. 1985. SAS user’s guide: statistics, version 5·18. SAS Institute Inc., Cary, NC.Google Scholar