Crossbred bull selection for bigger scrotum and shorter age at puberty with potentials for better quality semen

Reproduction in Domestic Animals = Zuchthygiene
M A R SiddiquiM Shamsuddin

Abstract

Shortening age at puberty of crossbred breeding bull is an important issue in the tropics. This study aimed at selecting crossbred bulls at earliest possible age with bigger scrotum and potential for donating quality semen. One hundred and 31 pre-joining crossbred bulls of Central Artificial Insemination Laboratory, Saver, Dhaka were examined. The bulls being trained by seeing semen collection from mature bulls were allowed ejaculation into the artificial vagina at homosexual mount during a 20 min time at three occasions, every three months. Eighty one of 131 bulls produced at least one ejaculate during the study and their mean +/- SD age and scrotal circumference (SC) were 20.3 +/- 4.7 months and 28.2 +/-2.7 cm, respectively. Bulls' body weight, body condition score (BCS) and SC influenced the attainment of their puberty (p < 0.05). Bull's body weight had positive effects on scrotal circumference and ejaculate volume (p < 0.05). Scrotal circumference positively influenced the percentages of normal spermatozoa (p < 0.05). Scrotal skin-fold thickness negatively influenced the proportion of spermatozoa with normal head (p < 0.05). Based on age at first ejaculate and SC, 29.6% bulls (n = 24) were selected by cluster analysis. Sele...Continue Reading

References

Sep 1, 1996·Journal of Reproduction and Fertility·J P KastelicG H Coulter
Jul 1, 1997·The Veterinary Clinics of North America. Food Animal Practice·F M Hopkins, J C Spitzer
Oct 7, 1998·Tropical Animal Health and Production·O Syrstad, J Ruane
Mar 10, 1999·Journal of Reproduction and Fertility·B P Setchell
Aug 1, 1961·Journal of Reproduction and Fertility·G M WAITES, G R MOULE
Aug 9, 2007·Tropical Animal Health and Production·M ShamsuddinK Nordlund

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Citations

Sep 14, 2019·Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie·Nedenia Bonvino StafuzzaFernando Baldi

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