Effect of urea in the diet on ovarian follicular dynamics and plasma progesterone concentration in Alpine goats

Revista Brasileira de Zootecnia

Bitencourt, Luciene Lignani¹  Cecon, Paulo Roberto¹  Guimarães, José Domingos¹  Alves, Nadja Gomes¹  Moraes, Elenice Andrade¹  Rodrigues, Marcelo Teixeira¹  Torres, Ciro Alexandre Alves¹  Amorim, Lincoln da Silva¹ 

[1] Universidade Federal de Viçosa

关键词: corpus luteum;    estrous cycle;    follicular development;    protein    IntroductionThe use of ultrasonography in reproduction allowed daily monitoring of ovarian follicular development during the estrous cycle;    demonstrating clear pattern of growth and regression of antral follicles;    with process of recruitment;    selection and follicular dominance in cattle (Ginther et al;   

DOI  :  10.1590/S1516-35982011000700016

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

To evaluate the effect of using urea in the diet on ovarian follicular dynamics and plasma urea and progesterone concentration, an experiment was carried out with 29 Alpine goats randomly distributed into four diets, each one containing 0%; 0.73%; 1.46% or 2.24% of urea on total dry matter. The follicular dynamics was monitored daily by ultrasonography. The estrous cycles were characterized by occurrence of two, three, four or five follicular waves. The emergence day of the first follicular wave in cycles with two waves, the length of the third wave and the maximum diameter of the largest follicle of the third wave in cycles with three waves presented a quadratic behavior according to the percentage of urea in the diets. In cycles with four waves, the urea intake did not influence the follicular dynamics. The interestrus and interovulatory periods and the luteal and follicular phases length did not differ among treatments. The plasma urea concentration did not differ among diets neither among collection weeks. Plasma progesterone concentration on the estrus day and on the 11th day after estrus presented quadratic behavior, and on the 15th day after estrus, it linearly reduced acording to the percentage of urea in the diets. The supply of urea in diets at levels up to 2.24% in dietary dry matter did not influence the dry matter intake and the urea plasma concentration. For goats, the emergence day and the length of the waves, the follicular diameter and the plasma progesterone concentration on the estrus day and in the latter stages of diestrus were altered when there was supply of urea in the diet.

【 授权许可】

CC BY-NC