Influence of the biostimulation on ovarian characteristics and pregnancy rate in nelore heifers
Abstract
The effects of biostimulation on the dimensions of ovarian structures, conception and pregnancy rates and weight gain were evaluated in Nelore heifers. In October 2005 the animals were divided in two treatments: biostimulated (BE), with the presence of vasectomized bulls with libido, and nonbiostimulated (NE), without the bull. Ultra-sonography exams were done for measurement of ovary, diameter of the largest follicle and corpora lutea when present, and also for pregnancy diagnose. Conception rate was of 100 and 80% and pregnancy rate of 62.5 and 25% for BE and NE groups, respectively. No changes on the initial and final ovarian dimensions or on the measurements of the diameter of the largest follicle and corpora lutea were observed between the groups. Treatments had significantly affected weight gain. Service rate per conception was smaller in BE. Biostimulation affect conception and pregnancy rate, but no effects on the ovary dimensions, diameter of the largest follicle and corpora lutea are observed. Decreasing weight gain and service rate per conception were observed in biostimulated heifers.Downloads
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Published
2008-11-26
Issue
Section
Animal Reproduction
License
Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons