Evaluation of the effects of different nutrient levels on performance of laying hens
Subject Areas : Agroecology JournalAli Nobakht 1 , yosef Mehmannavaz 2 , saman Mahdavy 3
1 - Scientific Boards of Animal Science Department, Islamic Azad University, Maragheh Branch.
2 - Scientific Boards of Animal Science Department, Islamic Azad University, Maragheh Branch.
3 - Scientific Boards of Animal Science Department, Islamic Azad University, Maragheh Branch.
Keywords: Performance, laying hen, Nutrient levels, Egg shell quality,
Abstract :
This study was conducted to evaluate the effects of different nutrient levels on performance of laying hens. This experiment was conducted with 320 laying hens from 32 to 42 weeks in a completely randomized design with five treatments and four replicates with 16 birds in each replicate. Experimental diets were isocaloric and included: diet nutrients recommended by Hy-line company for commercial laying hens (control), diet with 10 percent lower nutrient level than nutrient recommended by Hy-line company, nutrients recommended by NRC (1994), diet 10 percent higher nutrient level of nutrient recommended by NRC (1994) and diet with average energy of nutrients recommended by Hy-line company and NRC (1994). The results of this experiment showed that the performance and egg traits in laying hens were significantly affected by different experimental diets and the egg weight was significantly different between treatments (P<0.05). The highest amount of egg weight (60.35 g) was observed in control group. Also significantly differences were observed in egg mass between treatments (P<0.05). The highest amount of egg mass (53.72 g) was observed in control group, whereas nutrients recommended by NRC (1994) caused the lowest amount of that (49.84 g). Moreover, feed efficiency significantly affected by studied nutrients (P<0.05). The best amount of feed efficiency (2.13) was observed in control group. There was also significant difference between treatments for egg shell weight and the highest egg shell weight (6.07g) was observed in control group. The egg shell thickness was significantly affected by treatments, too (P<0.05) and the lowest egg shell thickness (304mm) was observed in control group. There was not any significantly difference between treatments in other traits such as feed price to produce one kilogram of egg (P>0.05). It can be concluded that performance and egg quality of laying hens can be improved by using nutrients levels recommended by Hy- line company for commercial laying hens.
1- مبارک قدم، م. 1377. مقایسه عملکرد چندگروه از مرغان هیبرید تخمگذار تولید شده در ایران. پایاننامه کارشناسی ارشد، دانشگاه آزاد اسلامی واحد خوراسگان،ص. 75-71
2- ولیزاده، م. و م. مقدم. 1373. طرحهای آزمایشی در کشاورزی. چاپ دوم. انتشارات پیشتاز علم، ص. 96-27
3. Anonymous. 1994. Nutrient requirements of poultry. 9th revised edition. National Research Council (NRC). National Academy Press. Washington. DC, 10-33.
4. Anonymous. 2006. Hy-Line variety W-36 commercial management guide. Hy-Line international publication. West Des Moines, Iowa U.S.A. Pp 56-70.
5. Courtis, J. A., and Wilson, G. C. 1990. Egg quality handbook. Queens land Department of primary industries, Austeralia, Pp 127-136.
6. Ehtesham, A., and Chowdhury, S. D. 2002. Reponses of laying chickens to diets formulated by following different feeding standards. Pakistan Journal of Nutrition 1(3): 127-131.
7. Inal, F., Coskun, B., Gulsen, N., and Kurtoglu, V. 2001. The effects of withdrawal of vitamin and trace mineral supplements from layer diets on egg yield and trace mineral composition. Britain Poultry Science 42: 77-80.
8. Keshavarz, K. 1998. Investigation on the possibility of reducing protein, phosphorus and calcium requirements of laying hens by manipulation of time access to these nutrients. Poultry Science 77: 1320-1332.
9. Leeson, S., Summers, J. D., and Caston, L. J. 2001. Response of layers to low nutrient density diets. Journal of Applied Poultry Research 10: 46-52.
10. Roland, D. A., Bryant, M. M., and Rabon, H. W. 1996. Influence of calcium and environmental temperature on performance of frist cycle commercial leghorns. Journal of Applied Poultry Research 3: 148-189.
11. SAS Institute. 1996. SAS Users guide: Statistics. Version 6.12. SAS Institute Inc., Cary, NC. 155-178.
12. Warren, W. A., and Emmert, J. L. 2000. Efficacy of phase- feeding in supporting growth performance of broiler chicks during the starter and finisher phases. Poultry Science 79: 764-770.
13. Wu, G., Liu, Z., Bryant, M. M., and Roland, D. A. 2005. Performance comparison and nutritional requirements of five commercial layer strains in phase. lV. International Journal of Poultry Science 4: 172-186.
14. Zimmerman, R. A. 1997. Management of egg size through precise nutrient delivery. Journal of Applied Poultry Research 6: 478-482.
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