EVALUATION AND PERFORMANCE TESTED BEEF BULLS BY BLUP

Evaluations of genotypexenvironment interactions of beef bulls performance-tested in feedlot or pasture.

Purebred Angus (n = 96) and Polled Hereford (n = 96) bull calves sired by bulls of either low or high yearling weight performance lines were assigned to either creep-fed or non-creep-fed treatment before weaning for four calf crops. For each breed, after weaning in the fall, half of the calves within each of the four groups were fed a high concentrate diet for 189 d after weaning in a feedlot a...

Changes in mean scrotal circumference in performance tested Swedish beef bulls over time

BACKGROUND There is a growing interest in beef cattle breeding in Sweden. The majority of the females are bred naturally, which is why it is important to choose healthy fertile bulls to obtain good reproduction and profitability. The breeding soundness evaluation includes measurement of scrotal circumference (SC). Our aim was to analyze if the SC of performance tested beef bulls has changed ove...

Phenotypic and genetic parameters for different measures of feed efficiency in different breeds of Irish performance-tested beef bulls.

No genetic parameters for performance and feed efficiency traits are available for Irish performance-tested bulls. The objective of this study was to determine the phenotypic and genetic variation for feed intake, BW, ADG, and measures of feed efficiency including feed conversion ratio (FCR), relative growth rate, Kleiber ratio, residual BW gain (RG), and residual feed intake (RFI). Observation...

Demasculinization of Beef Bulls by LH Immunization

Breeding Soundness Evaluation for Beef and Dairy Bulls - FSA-3046

The breeding soundness evaluation (BSE) is a practical method to identify bulls with less than satis­ factory breeding potential. This evalu­ ation should be conducted on every bull at least 30 to 60 days before each breeding season to allow enough time for replacement of deferred or unsatis­ factory bulls. The first step in a BSE is to select a veterinarian in your area who is competent in con...