增加开产前日粮密度对肉用仔鸡行为、皮质酮水平和早期冷应激下性能反应的影响

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Mariana Diniz Costa Vasconcelos , Lorena Salim Sousa , Tainá Silva Brandão Lopes , Larissa Moreira Gonçalves , Aline Bernardes de Souza , Nathália Morais Avelar , Júlia Macedo Fernandes Oliveira , Fabíola de Oliveira Paes Leme , Leonardo José Camargos Lara , Itallo Conrado Sousa Araújo
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引用次数: 0

摘要

本研究评估了在肉鸡出生后最初 14 天的冷应激条件下,增加开产前日粮密度对其新陈代谢、嗉囊充盈度和整体性能的影响。实验使用了 576 只来自 27 周龄种鸡的一天龄 Cobb500 雄鸡,采用 2 × 2 的排列方式,改变热条件(恒温或在 18 °C 下冷应激 8 小时)和开产前日粮成分(粗蛋白 21.5%、2970 千卡/千克或 22.5%、3050 千卡/千克)。冷应激组在前两天泄殖腔温度较低,嗉囊填充率下降(P < 0.05)。冷应激组雏鸡在 1 天和 5 天的行为明显受到影响(P < 0.05),7 天时血清中皮质酮水平较高(P < 0.05)。高密度饲料组 7 天的采食量较低(P < 0.05)。在 7 天和 35 天的采食量、体重增加或饲料转化率方面没有观察到明显的交互作用(P > 0.05)。冷应激导致性能损失,影响饲料转化率和生产效率指数。高密度日粮只在第一周内对生产性能有影响,随后的日粮没有任何影响,这表明仅靠日粮调节不足以减轻冷应激引起的损失。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact of increased pre-start diet density on broiler chick behavior, corticosterone levels, and performance responses under cold stress during early life

This study assessed the effects of increased pre-start diet density on the metabolism, crop filling, and overall performance of broilers under cold stress during their initial 14 days of life. Using 576 one-day-old Cobb500 male chicks from 27-week-old breeders, the experiment employed a 2 × 2 arrangement, varying thermal conditions (thermoneutrality or cold stress at 18 °C for 8 h) and pre-start diet composition (21.5% crude protein, 2970 kcal/kg or 22.5%, 3050 kcal/kg). The cold stress group exhibited lower cloacal temperature and decreased crop filling rate during the first two days (P < 0.05). Chick behavior was significantly affected at 1 and 5 days (P < 0.05), and corticosterone levels in serum were higher for the cold stress group at 7 days (P < 0.05). Feed intake at 7 days was lower in the high-density feed group (P < 0.05). No significant interactions were observed for feed intake, body weight gain, or feed conversion ratio at 7 and 35 days (P > 0.05). Cold stress resulted in performance losses, impacting feed conversion and the Productive Efficiency Index. The dense diet influenced performance only within the first week, with subsequent diets showing no effect, suggesting dietary manipulation alone was insufficient to mitigate cold stress-induced losses.

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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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