- Volume 17 Issue 10
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Effects of Dietary Crude Protein on Growth Performance, Nutrient Utilization, Immunity Index and Protease Activity in Weaner to 2 Month-old New Zealand Rabbits
- Lei, Q.X. (Poultry Institute, Shandong Academy of Agricultural Science) ;
- Li, F.C. (College of Animal Science and Technology, Shandong Agricultural University) ;
- Jiao, H.C. (College of Animal Science and Technology, Shandong Agricultural University)
- Received : 2003.12.19
- Accepted : 2004.05.31
- Published : 2004.10.01
An experiment was conducted to determine the effects of different dietary crude protein (CP) levels on growth performance, nutrient utilization, small intestine protease activity and immunity index of weaner to 2 month-old New Zealand rabbits. Eighty weaner rabbits were allocated in individual cages to five treatments in which they were fed diets with CP at 14%, 16%, 18%, 20% and 22%, respectively. The growth performance and nutrient digestibility of rabbits increased firstly when dietary CP increased, then decreased. The average daily gain was the highest and feed conversion rate was the lowest when dietary CP reached 20%, namely 34.9 g/d and 2.74:1, respectively. Maximum CP digestibility was 72.1% in the 18% CP group, maximum crude fiber digestibility of 28.4% occurred in the 16% CP group and was significantly different from other treatments (p<0.01), apparent digestibility of Lys and Val followed the same trend as CP digestibility, and reached their maximum when dietary CP was 18%. Apparent digestibility of Cys, Tyr, Leu and Thr also had a similar trend to CP digestibility. Nitrogen retention (RN) increased with CP level (p>0.05), and was highest for 20% CP treatment (1.5 g/d). The effect of CP level on the rate of digestible nitrogen (DN) converted RN was small. The spleen index, thymus index, chymotrypsin and trypsin activities in small intestine were highest when dietary CP was 16%, which were 1.0, 2.8, 15.7 U/g and 125.7 U/g, respectively. There was no significant difference among treatments (p>0.05). According to the above results, the appropriate dietary CP level from weaner to 2 month-old meat rabbits was 18-20%.
Supported by : Department of Sciece and Technology of Shandong Province
- de Blas, J. C. 1985. Units for feed evaluation and requirements for commercially grown rabbits. J. Anim. Sci. 60:1021-1028. https://doi.org/10.2527/jas1985.6041021x
- de Blas. 1998. The Nutrition of the Rabbit.CABI Publishing. p. 42, p. 246.
- Moughan, P. J., W. H. Schultze and W. C. Smith. 1988 Amino acid requirements of the growing meat rabbit. 1. The amino acid composition of rabbit whole-body tissue-a theoretical estimate of ideal amino acid balance. Animal Production 47:297-301.
- Taboada, E., J. Mendez and C. de Blas. 1996. The response of highly productive rabbits to dietary sulphur amino acid content for reproduction and growth. Reproduction, Nutrition and Development 36:191-203.
- Xu, Z. R., X. T. Zou and C. H. Hu. 2002. Effects of dietary fructooligosaccharide on digestive enzyme activities, intestinal microflora and morphology of growing pigs. Asian-Aust. J. Anim. Sci. 15:1784-1789.
- Singh, B. 1988. Utilization by growing rabbits of a low protein diet with or without urea and groundnut cake supplementation. The Journal of Applied Rabbits Research 11:25-28.
- Abdella, H. M. 1988. Effect on growing rabbits of feeding different levels of crude protein. The Journal of Applied Rabbit Research 11:252-256.
- Omole, T. A. 1982. The effect of dietary protein on growth and reproduction performance in rabbits. The Journal of Applied Rabbit Research 5:83.
- Wang, Y. X. 1991. The study of protein requirement in growing meat rabbits. Journal of Shandong Agricultural University 6:137-145.
- Taboada, E., J. Mendez, G. G. Mateos and C. de Blas. 1994. The response of highly productive rabbits to dietary lysine content. Livestock Production Science 40:329-337.
- Yang, S. 1993. Feed analysis and feed quality assay. Beijing Agricultural University Press, 1993.
- Cheeke, P. R. 1981. Effect of alfalfa and dietary fiber on the growth performance of weaning rabbits. Lab. Anim. Sci. 28:167-172.
- Lang, J. 1981. The nutrition of the commercial rabbit. 1. physiology, digestibility and nutrient requirements. Nutr. Abstr. Rev. 51:197.
- Xie, X. H. 1990. Effects of dietary crude protein and fiber on digestibility of meat rabbit. Chinese Journal of Rabbit Farming 3:16-18.
- Xu, L. D. 1982. The nutrition and diets. Feed and Animal 3:22-25.
- de Blas, C., E. Taboada, N. Nicodemus, R. Campos and J. Mendez. 1996. The response of highly productive rabbits to dietary threonine content for reproduction and growth. In: (Ed. F. Labas) Proceedings of the 6th World Rabbit Congress, Toulouse. Association Francaise de Cuniculture, Lempdes, pp. 139-144.
- NRC. 1977. Nutient requirements of domestic animals, No. 9. Nutrient requirements of rabbits. Second Revised Ed. National academy of sciences-National Research Council, Washington, DC.
- Wang, S. C. 1999. The effect of different nutrient levels on growth performance of meat rabbits. Chinese Journal of Rabbit Farming 6:20-22.
- Tang, L. M. 1987. Effects of dietary energy and protein on production performances of growing rabbits. Chinese Journal of Rabbit Farming 6:21-23.