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当前位置: 首页 > 文章 > Circulating leptin and its muscle gene expression in Nellore cattle with divergent feed efficiency 畜牧与生物技术杂志(英文版) 2017,8
Position: Home > Articles > Circulating leptin and its muscle gene expression in Nellore cattle with divergent feed efficiency Journal of Animal Science and Biotechnology 2017,8

Circulating leptin and its muscle gene expression in Nellore cattle with divergent feed efficiency

作  者：
Lúcio Flávio Macêdo Mota;Cristina Moreira Bonafé;Pâmela Almeida Alexandre;Miguel Henrique de Almeida Santana;Francisco José de Novais;Erika Toriyama;Aldrin Vieira Pires;Saulo da Luz e Silva;Paulo Roberto Leme;José Bento Sterman Ferraz;Heidge Fukumas
单  位：
Present adress: Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista, Jaboticabal, Brazil;Departamento de Zootecnia, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, Brazil;Departamento de Medicina Veterinária, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, Brazi;Departmento de Zootecnia e Desenvolvimento Agrossocioambiental Sustentável, Faculdade de Veterinária, Universidade Federal Fluminense, Niteroi, Brazil;Departmento de Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil;Departamento de Medicina Veterinária, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, Brazil
关键词：
Beef cattle;Energy homeostasis;Fat depositon;Residual feed intak
摘  要：
Background: Leptin has a strong relation to important traits in animal production, such as carcass composition, feed intake, and reproduction. It is mainly produced by adipose cells and acts predominantly in the hypothalamus. In this study, circulating leptin and its gene expression in muscle were evaluated in two groups of young Nellore bulls with divergent feed efficiency. Individual dry matter intake (DMI) and average daily gain (ADG) of 98 Nellore bulls were evaluated in feedlot for 70 d to determinate the residual feed intake (RFI) and select 20 animals for the high feed efficient (LRFI) and 20 for the low feed efficient (HRFI) groups. Blood samples were collected on d 56 and at slaughter (80 d) to determine circulating plasma leptin. Samples of Longissimus dorsi were taken at slaughter for leptin gene expression levels. Results: DMI and RFI were different between groups and LRFI animals showed less back fat and rump fat thickness, as well as less pelvic and kidney fat weight. Circulating leptin increased over time in all animals. Plasma leptin was greater in LRFI on 56 d and at slaughter (P = 0.0049). Gene expression of leptin were greater in LRFI animals (P = 0. 0022) in accordance with the plasma levels. The animals of the LRFI group were leaner, ate less, and had more circulating leptin and its gene expression. Conclusion: These findings demonstrated that leptin plays its physiological role in young Nellore bulls, probably controlling food intake because feed efficient animals have more leptin and lower residual feed intake.

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