Plasma urea nitrogen and progesterone concentrations and follicular dynamics in ewes fed proteins of different degradability

Revista Brasileira de Zootecnia

Gustavo Bianchi Lazarin²  Nadja Gomes Alves²  Juan Ramon Olalquiaga Perez²  Renato Ribeiro De Lima¹  Iraides Ferreira Furusho Garcia²  Antônio José Neto²  Daniel Navarro Cardoso Do Vale²  Gabriela De Abreu Saunders² 

[1] ,Universidade Federal de Lavras Departamento de Zootecnia

关键词: corn gluten meal;    flushing;    ovarian follicles;    ovulation number;    soybean meal;   

DOI  :  10.1590/S1516-35982012000700012

来源: SciELO

【 摘 要 】

The effects of overfeeding with protein of different degradability on body condition, plasma urea nitrogen and progesterone concentrations, ovulation number and follicular dynamics were assessed in Santa Ines ewes. Twelve ewes were assigned to a randomized block design according to body weight and received overfeeding with soybean meal or with corn gluten meal or maintenance diet for 28 days before ovulation and during the next estrous cycle. Blood samples were taken on days 7, 14, 21, and 28 after the beginning of treatments for analysis of plasma urea nitrogen and on days 3, 6, 9, 12, and 15 into the estrous cycle for analysis of plasma urea nitrogen and progesterone. Follicular dynamics was monitored daily by ultrasound during one estrous cycle. Dry matter and crude protein intake, weight gain, plasma urea nitrogen concentration before ovulation, number of ovulations, diameter of the largest follicle of the 1st and of the 2nd waves and the growth rate of the largest follicle of the 1st wave were higher in the ewes that received overfeeding. The growth rate of the largest follicle of the 3rd wave was higher in the ewes fed maintenance diet. The back fat thickness, plasma urea nitrogen before ovulation and progesterone concentrations, diameter of the largest follicle of the 2nd wave and growth rate of the largest follicle of the 3rd wave were higher in ewes that received overfeeding with soybean meal. The growth rate of the largest follicle of the 1st wave was higher in ewes that received overfeeding with corn gluten meal. Overfeeding with protein-rich feeds may increase the ovulation number and with soybean meal, it may be effective in increasing plasma progesterone concentration in ewes.

【 授权许可】

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