Characteristics of follicular wave development in prepubertal Bos taurus indicus heifers of two different body sizes
Abstract
The purpose of this study was to evaluate in a period of 42 days prior to the onset of puberty (PB), the effects of size (small size and large size) of prepubertal Brahman heifers (BHM) on; age, characteristics of follicular dynamics, and body composition parameters. In addition, the frame score (body structure) was calculated as an additional estimator of height. We defined PB as the first ovulation preceded by the observation of estrus and followed by the formation of a corpus luteum (CL) of normal duration. Prepubertal BHM (10) heifers were used. The feeding was individual with corn silage and commercial concentrate to obtain similar weight gains. Measurements of weight and body condition score (BCS) were performed every 14 d. Ovulation and the formation of the CL were confirmed according to the monitoring of the ovarian structures by ultrasonography. Statistically, correlation analysis and analysis of variance were performed with the GLM procedure of SAS. A significant effect of size on the total number of follicles at PB was found, where small-sized heifers had 16 follicles, while those of large size had 12 follicles at PB (P < 0.0001). The frame score of the undersized animals was 10 % higher than that of the oversized heifers (P < 0.0001). Likewise, the frame score had a significant effect (P < 0.0001) on the total number of follicles in the PB. In conclusion, the effect of height in prepubertal animals is a complex characteristic, associated with body composition parameters, which affects some of the characteristics of follicular dynamics, and is worth further study in Zebu cattle.
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