Influence of dietary amino acid density, crude protein level, and feed scheduling on performance and carcass traits of Ross 708 female broilers slaughtered between 1.9 and 2.0 kg

IF 1.6 3区农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE Journal of Applied Poultry Research Pub Date : 2024-03-12 DOI:10.1016/j.japr.2024.100427

C.W. Maynard , C.L. Williams , M.T. Kidd

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Abstract

Adjustments in dietary amino acid density, CP levels, and feed scheduling influence broiler performance, carcass traits, and integrator profitability. Therefore, 2 experiments were conducted to assess the former factors on the live performance and carcass traits of female Ross 708 broilers grown for a high-value bone-in market (36 d processing). Experiment 1 evaluated 4 amino acid densities while Experiment 2 was arranged as a 2 × 2 factorial evaluating dietary CP and feed scheduling. Amino acid density in Experiment 1 had no effect on any performance or processing parameter except feed conversion which was decreased for birds fed the Medium diet. The lack of substantial improvement in live performance resulted in increased feed, live BW, and carcass costs per kg. Neither feed scheduling nor dietary CP had an effect on live performance in Experiment 2. However, feeding low CP diets resulted in increased total breast meat yield, whereas increasing the number of feeding phases decreased total breast meat yield. In conclusion, dietary alterations in amino acid density in female broiler broilers warrants further attention.

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日粮氨基酸密度、粗蛋白水平和饲料安排对屠宰体重在 1.9 至 2.0 千克之间的 Ross 708 雌性肉鸡的性能和胴体特征的影响

日粮氨基酸密度、CP 水平和饲料安排的调整会影响肉鸡的生产性能、胴体性状和饲养效益。因此，我们进行了两项实验，以评估前述因素对雌性 Ross 708 肉鸡活体性能和胴体性状的影响，这些肉鸡是为高价值的带骨肉鸡市场（36 天加工）而饲养的。实验 1 评估了四种氨基酸密度，而实验 2 则以 2 × 2 因式分解评估了日粮 CP 和饲料安排。实验 1 中的氨基酸密度对任何性能或加工参数都没有影响，只有饲料转化率对饲喂中等日粮的禽类有所降低。由于活体性能没有得到实质性改善，每公斤饲料、活体体重和胴体成本都有所增加。在实验 2 中，饲料安排和日粮 CP 对活体性能都没有影响。然而，饲喂低 CP 日粮会提高胸肉总产量，而增加饲喂阶段数则会降低胸肉总产量。总之，雌性肉鸡日粮氨基酸密度的改变值得进一步关注。

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来源期刊

Journal of Applied Poultry Research 农林科学-奶制品与动物科学

CiteScore

4.10

自引率

10.50%

发文量

审稿时长

104 days

期刊介绍： The Journal of Applied Poultry Research (JAPR) publishes original research reports, field reports, and reviews on breeding, hatching, health and disease, layer management, meat bird processing and products, meat bird management, microbiology, food safety, nutrition, environment, sanitation, welfare, and economics. As of January 2020, JAPR will become an Open Access journal with no subscription charges, meaning authors who publish here can make their research immediately, permanently, and freely accessible worldwide while retaining copyright to their work. Papers submitted for publication after October 1, 2019 will be published as Open Access papers. The readers of JAPR are in education, extension, industry, and government, including research, teaching, administration, veterinary medicine, management, production, quality assurance, product development, and technical services. Nutritionists, breeder flock supervisors, production managers, microbiologists, laboratory personnel, food safety and sanitation managers, poultry processing managers, feed manufacturers, and egg producers use JAPR to keep up with current applied poultry research.