Plasma urea nitrogen and progesterone concentrations and follicular dynamics in ewes fed proteins of different degradability
AUTOR(ES)
Lazarin, Gustavo Bianchi, Alves, Nadja Gomes, Perez, Juan Ramon Olalquiaga, Lima, Renato Ribeiro de, Garcia, Iraides Ferreira Furusho, José Neto, Antônio, Vale, Daniel Navarro Cardoso do, Saunders, Gabriela de Abreu
FONTE
Revista Brasileira de Zootecnia
DATA DE PUBLICAÇÃO
2012-07
RESUMO
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.
Documentos Relacionados
- Effect of urea in the diet on ovarian follicular dynamics and plasma progesterone concentration in Alpine goats
- Effect of eCG on the follicular dynamics and vascularization of crossbred cows with different circulating progesterone concentrations during synchronization of ovulation in an FTAI protocol
- MONITORING OF PROGESTERONE AND ESTRONE FECAL METABOLITES THROUGHOUT GESTATION IN EWES
- Substitution of rumen degradable nitrogen with urea in sheep fed low quality Eragrostis curvula hay
- Seasonal pattern of plasma progesterone, prolactine and melatonine concentrations in ewes kept at lower latitudes