Dietary effects of protected fat, glycerol, and soybean meal on performance, physiological parameters, carcass characteristics, and behavioral measurements of late-fattening Hanwoo steers under heat stress conditions.

IF 2.4 2区农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Animal Bioscience Pub Date : 2024-04-25 DOI:10.5713/ab.23.0503

Jun Sik Woo, Gyeong Rim Ryu, Jeong Hoon Kim, Sun Sik Jang, Hong Gu Lee, K. Park

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引用次数: 0

Abstract

Objective This study aimed to determine the effects of increasing energy and protein levels in diets by including protected fat (PF), glycerol (GL), and soybean meal (SBM) on growth performance, physiological parameters, carcass characteristics, and behavioral measurements of late-fattening Hanwoo steers under heat stress conditions. Methods Thirty-six steers (initial BW, 724.9 ± 58.3 kg; age, 25.5 ± 0.4 month) were assigned into Control (TDN 76%, CP 15%), PF (TDN 83.6%, CP 15%), PF+GL (TDN 83.6%, CP 15%) and PF+GL+SBM (TDN 83.6%, CP 16.5%) by randomized complete block design for a total of 16 weeks with division of 4 week periods. The average temperature-humidity index was 87.0 (1st period; Severe), 82.8 (2nd; Moderate), 71.4 (3rd; Comfort), and 68.1 (4th; Comfort). Results The DMI showed no treatments differences during the whole experiment. However, DMI in 1st and 2nd period decreased by approximately 30% and 10% compared to 4th period, respectively. Higher ADG and FCR were noted for treatments compared to Control at both 1st and 2nd period (p<0.05). There were no treatment effects on rectal temperature (RT), cortisol, and behaviors during the entire experiment. However, both RT and cortisol in 0, 1st and 2nd period were higher than those of 3rd and 4th period (p<0.05). Carcass yield and grade remained unaffected by increasing TDN and CP levels. Behavioral changes in the hot season (1st period) included reduced lying (43%), increased standing (48%), decreased walking (62%), and decreased eating (38%) (p<0.05), with an increase in drinking by 54%. Rumination during standing was 53% higher, while rumination during lying was about 33% lower compared to the post-hot season (3rd period) (p<0.05). Conclusion Dietary supplementation of protected fat in late-fattening Hanwoo steers under heat stress had a positive effect on preventing a reduction in performance.

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在热应激条件下，保护脂肪、甘油和豆粕对后期育肥汉和公牛的性能、生理参数、胴体特征和行为测量的影响。

目的本研究旨在确定在热应激条件下，通过添加保护性脂肪（PF）、甘油（GL）和豆粕（SBM）来提高日粮中能量和蛋白质水平对汉乌牛后期育肥生长性能、生理参数、胴体特征和行为测定的影响。方法采用随机完全区组设计，将 36 头阉牛（初始体重为 724.9 ± 58.3 kg；年龄为 25.5 ± 0.4 月龄）分为对照组（TDN 76%，CP 15%）、PF 组（TDN 83.6%，CP 15%）、PF+GL 组（TDN 83.6%，CP 15%）和 PF+GL+SBM 组（TDN 83.6%，CP 16.5%），共 16 周，每 4 周为一个阶段。平均温湿度指数为 87.0（第 1 期；严重）、82.8（第 2 期；中等）、71.4（第 3 期；舒适）和 68.1（第 4 期；舒适）。但是，与第四期相比，第一和第二期的 DMI 分别下降了约 30% 和 10%。与对照组相比，处理组在第 1 期和第 2 期的 ADG 和 FCR 均较高（P<0.05）。在整个实验期间，处理对直肠温度（RT）、皮质醇和行为没有影响。然而，0、1 和 2 期的 RT 和皮质醇均高于 3 和 4 期（p<0.05）。胴体产量和等级不受 TDN 和 CP 水平增加的影响。热季（第 1 期）的行为变化包括卧地减少（43%）、站立增加（48%）、行走减少（62%）和采食减少（38%）（p<0.05），饮水增加 54%。与热季后（第 3 期）相比，站立时的反刍量增加了 53%，而躺卧时的反刍量减少了约 33%（p<0.05）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Animal Bioscience AGRICULTURE, DAIRY & ANIMAL SCIENCE-

CiteScore

5.00

自引率

0.00%

发文量

223

审稿时长

3 months