Injury or undue stress to restrained females. There were differences in the number of mounts performed. Thus, mating ability has a learning component Chenoweth, Earlier attempts at linking luteinizing hormone LH or testosterone T levels with bull sex-drive were, however, disappointing Foote et al.
Coulter and Kozub also used a regression model to predict bull fertility in multi- sire breeding where paternity was determined by blood typing. The individual capabilities of bulls have greater impact on herd fertility than do BFRs and these capabilities can generally be assessed prior to the breeding season to minimize risk. Although criticism has been levelled at such procedures for not allowing concurrent assessment of mating ability, the additional use of the BSE and judicious pasture observation should minimize these concerns. The fertility indices derived were, in general, highly predictive of pregnancy rate, even at 11 mo prior to mating. Influence of single or multiple sires and serving capacity on mating behavior of beef bulls. Several points are apparent. Some of the pitfalls which may be encountered Chenoweth, b are described as follows: Earlier attempts at linking luteinizing hormone LH or testosterone T levels with bull sex-drive were, however, disappointing Foote et al. Bull management to maximize sperm output. This was illustrated in a study by Farin et al. Every precaution should be taken to ensure that diseases such as vibriosis and trichomoniasis are not transmitted by such procedures. Serving capacity of crossbred yearling bulls. Testosterone and libido in Holstein bulls of various ages. Heat detection programs and techniques. Apart from taking precautions to handle cattle quietly and to avoid distractions, there is no easy solution to this problem, which can lead to depressed scores. However, the BSE classification aids in identifying differences in ability to impregnate at those services. Breeding soundness, libido and performance of beef bulls mated to estrus synchronized heifers. The most important traits were found to be scrotal circumference, backfat, sperm morphology particularly primary abnormalities and sex-drive. A comparison of three methods of assessing sex-drive in yearling beef bulls and relationships with testosterone and LH levels. Libido and semen quality both influenced pregnancy rates of Brangus bulls in Florida, with libido having most effect A. Work is proceeding with such indirect tests to define dosages, sampling times and the effects of bull age, genotype, season and nutrition. Anecdotal evidence for breed differences in bull sex-drive has long been reported. A Fertility Index for Bulls? Changes in libido-fertility relationships as beef bulls mature. Although not practicable in many cases, single-sire mating is inherently more efficient than multi-sire mating.
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