日粮中添加富硒桑叶粉对陕南白山羊屠宰性状和肌肉脂肪酸的影响

doi:10.12160/j.issn.1672-5190.2023.01.008

Abstract

Abstract:

[Objective] This study aimed to investigate the effects of dietary supplementation of selenium-rich mulberry leaf powder on slaughtering traits, physicochemical properties of muscle as well as contents of muscular fatty acids and selenium in Shannan white goats. [Method] A total of 30 gelded Shannan white goats aged 3 months were randomly assigned into a control group （n=15） or an experimental group （n=15）. The control group fed a basal diet, and the experimental group fed the same basal diet supplemented with 15% selenium-rich mulberry leaf powder. The experimental period was 60 days, including a 15-day pre-feeding experiment and a 45-day formal feeding experiment. At the end of the experiment, a slaughtering experiment was conducted to determine the indicators associated with slaughtering traits and physicochemical properties of muscle. In addition, the longissimus dorsi muscle of the goats were sampled, and the contents of fatty acids and selenium were evaluated. [Result] Dietary supplementation of selenium-rich mulberry leaf powder significantly （P<0.05） increased the muscular pH_{1 h} value and water loss rate. The experimental group had higher loin eye area and carcass weight in comparison to the control group, while no significant （P>0.05） differences were observed. A total of 19 fatty acids were determined in the longissimus dorsi muscle of the goats in both groups, including 5 saturated fatty acid （SFA） and 14 unsaturated fatty acid （NSFA）. The both groups had similar proportions of muscular SFA, monounsaturated fatty acid （MUFA） and polyunsaturated fatty acid （PUFA） contents accounting for the total contents of fatty acids, which were approximately 28%, 67% and 5%, respectively. Compared with the control group, the content of muscular gamma-linolenic acid in the experimental group was significantly （P<0.05) higher, while the total contents of muscular fatty acids were significantly （P<0.05） lower. The experimental group had higher （P>0.05） content of muscular selenium than the control group. The content of muscular selenium in both of the experimental group （0.071 3 mg/kg） and the control group （0.066 0 mg/kg） reached the Shaanxi provincial food standard for selenium-containing meat. [Conclusion] Dietary supplementation of 15% selenium-rich mulberry leaf powder improves meat production, promotes selenium enrichment in muscle, and reduces carcass fat deposition in Shannan white goats to a certain extent. Due to the significantly increased muscular water loss rate, water losing should be avoided as much as possible during the goat meat storage and transportation.

Key words: mulberry, Shannan white goats, slaughtering traits, muscular fatty acids, selenium

CLC Number:

S827.5

CHEN Ling, YANG Jing-xian, CHENG Wen-yu, SONG Yuan-bo, WANG Yue-xi, HE Zhi-qin, ZHOU Yue-ting, CHU Qu, PENG Yun-wu, CHEN Zheng-yu, LIU Qiang. Effects of Dietary Supplementation of Selenium-rich Mulberry Leaf Powder on Slaughtering Traits and Muscular Fatty Acids in Shannan White Goats[J]. Animal Husbandry and Feed Science, 2023, 44(1): 54-59.

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Effects of Dietary Supplementation of Selenium-rich Mulberry Leaf Powder on Slaughtering Traits and Muscular Fatty Acids in Shannan White Goats

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