Efecto del consumo residual de alimento (RFI) sobre la fertilidad en toretes angus y hereford en el estado de Chihuahua, México

Abstract

In the Palomas complex of a Regional Livestock Union of Chihuahua, Mexico, the residual consumption of food was evaluated, on the fertility of 20 bulls of the Angus race and 20 bulls of the Herford race. The different variables were evaluated through the Student T statistical, regressions and correlations, using the statistical software IBM SPSS v21. The results showed no statistical differences between breeds (P> 0.05) for the weaning weight of the Angus breed (228.0 kg), compared to the Hereford breed (213.0 kg), for the daily gain of weight Angus (2.0 kg) Hereford (2.0 kg), for the feed conversion Angus (6.0) Hereford (6.0); and for residual food consumption (-0.15) Hereford (-0.16 kg). However, if statistical differences were found (P <0.05) for the initial weight variables Angus (320.0 kg) Hereford (284.0 kg); final weight Angus (449.0 kg) Hereford (406.0 kg), and for daily consumption of dry matter Angus (12.0 kg), Hereford (10.0 kg). Regarding the reproductive variables, no significant differences were reported between races (P> 0.05) for the volume of ejaculate Angus (1.61 ml) Hereford (2.35 ml), and progressive motility Angus (32.91%) Herford (32.44%). Significant differences were reported for scrotal circumference Angus (34.35 cm) Hereford (31.80 cm); Angus static motility (40.0%) Hereford (30.5%); and for mobile motility Angus (61.74%) Hereford (69.53%). In conclusion, bulls with efficient feeding showed decreased fertility, when compared with bulls with less efficient feeding