Beef breed bulls versus selected dual purpose bulls for meat production

Sexual Aggressiveness in Beef Bulls

Immunization Against Inhibin Increases Sperm Production in Young Beef Bulls

Fertility of yearling beef bulls during mating.

Crossbred (Bos taurus) yearling beef bulls were assessed for breeding soundness and physical traits prior to multi-sire natural mating at pasture. Bulls (n = 60) were assigned to six groups of nine or 10 bulls and two bull-groups were rotated on 14-day intervals during a 63-day mating season in each breeding herd (n = 3) of 191-196 cows. The remaining bulls (n = 14) were maintained under simila...

Demasculinization of Beef Bulls by LH Immunization

Estimation of Carcase Composition of Beef Bulls

The regression of muscle:bone ratio on carcase weight was 0.0055 k 0.0017 kg. The mean muscle: bone ratio adjusted to a carcase weight of 213 kg was 3.99 * 0.20. There was little variation in muscle:bone ratio among individuals and the differences between sire progeny groups were not significant. However, the number of progeny within each group was small and a wider sampling is required to esta...