Effects of melatonin implantation on carcass characteristics, meat quality and tissue levels of melatonin and prolactin in Inner Mongolian cashmere goats  

作　　者：Tao Duan Ziyuan Wu Huan Zhang Ying Liu Yan Li Wei Zhang 

机构地区：[1]State Key Laboratory of Animal Nutrition,College of Animal Science and Technology,China Agricultural University,Beijing 100193,People’s Republic of China [2]Beijing Sunlon Livestock Development Company,Beijing 100076,People’s Republic of China [3]College of Animal Science,Zhejiang University,Hangzhou 310085,People’s Republic of China

出　　处：《Journal of Animal Science and Biotechnology》2019年第4期1081-1088,共8页畜牧与生物技术杂志（英文版）

基　　金：supported by China Agriculture Research System(CARS-39)

摘　　要：Background: Implantation of goats with melatonin can induce cashmere growth and significantly increase cashmere production performance. However, the impact of melatonin implantation on the carcass characteristics,meat quality and related hormone levels in muscle and viscera of cashmere goats has not been studied. This experiment was conducted to determine the effects of melatonin implantation of cashmere goats during the nongrowing period on meat quality and related hormone levels in the tissues. It aimed to provide a theoretical basis for the practical application of melatonin in cashmere goat production systems.Results: Melatonin implantation(2 mg/kg live weight) had no influence(P > 0.05) on daily weight gain, carcass weight, dressing percentage, loin muscle area, or the p H, moisture level, crude fat(except for Gluteus muscle) and amino acid content of muscles of cashmere goats. After implantation for 1 month, shear force of Longissimus dorsi and water loss rate of Longissimus dorsi and Biceps femoris of cashmere goats were increased(P < 0.05), whereas the cooking yield of Gluteus muscle was reduced(P < 0.05). The melatonin treatment decreased(P < 0.05) muscle crude protein, Gluteus muscle crude fat and ∑n-3 PUFA content and decreased(P < 0.05) ∑n-6 PUFA content.However, after 2 months of implantation most of these effects had resolved. Melatonin implantation had no effect(P >0.05) on the melatonin or prolactin contents of kidney, heart, spleen, liver, Longissimus dorsi, Biceps femoris and Gluteus muscles. Melatonin content of lung tissue was lowered(P < 0.05) and that of prolactin was elevated(P < 0.05) by the melatonin implantation.Conclusion: This study has shown little impact of melatonin implantation of cashmere goats on carcass quality. A few meat quality indices i.e., shear force, water loss rate, ∑n-3 PUFA, ∑n-6 PUFA, and crude protein content of Longissimus dorsi;water loss rate, cooking yield and crude protein content of Biceps femoris;ether extract, crude protein content of Gluteus;were affBackground: Implantation of goats with melatonin can induce cashmere growth and significantly increase cashmere production performance. However, the impact of melatonin implantation on the carcass characteristics,meat quality and related hormone levels in muscle and viscera of cashmere goats has not been studied. This experiment was conducted to determine the effects of melatonin implantation of cashmere goats during the nongrowing period on meat quality and related hormone levels in the tissues. It aimed to provide a theoretical basis for the practical application of melatonin in cashmere goat production systems.Results: Melatonin implantation(2 mg/kg live weight) had no influence(P > 0.05) on daily weight gain, carcass weight, dressing percentage, loin muscle area, or the p H, moisture level, crude fat(except for Gluteus muscle) and amino acid content of muscles of cashmere goats. After implantation for 1 month, shear force of Longissimus dorsi and water loss rate of Longissimus dorsi and Biceps femoris of cashmere goats were increased(P < 0.05), whereas the cooking yield of Gluteus muscle was reduced(P < 0.05). The melatonin treatment decreased(P < 0.05) muscle crude protein, Gluteus muscle crude fat and ∑n-3 PUFA content and decreased(P < 0.05) ∑n-6 PUFA content.However, after 2 months of implantation most of these effects had resolved. Melatonin implantation had no effect(P >0.05) on the melatonin or prolactin contents of kidney, heart, spleen, liver, Longissimus dorsi, Biceps femoris and Gluteus muscles. Melatonin content of lung tissue was lowered(P < 0.05) and that of prolactin was elevated(P < 0.05) by the melatonin implantation.Conclusion: This study has shown little impact of melatonin implantation of cashmere goats on carcass quality. A few meat quality indices i.e., shear force, water loss rate, ∑n-3 PUFA, ∑n-6 PUFA, and crude protein content of Longissimus dorsi;water loss rate, cooking yield and crude protein content of Biceps femoris; ether extract, crude protein content of Gluteus;were af

关 键 词：CARCASS characteristics CASHMERE GOAT MEAT quality MELATONIN 

分 类 号：S827[农业科学—畜牧学]