HERITABILITY OF SCROTAL CIRCUMFERENCE IN ONE- AND TWO-YEAR-OLD BULLS OF DIFFERENT BEEF BREEDS
نویسندگان
چکیده
منابع مشابه
A Comparison of Different Breeds for Growth Rates, Performance Traits and Scrotal Circumference in Young Beef Bulls
spring (a cow changing from a 6.0 to a 4.8) would be associated with an additional 15 days to first estrus after calving compared to a cow that maintained body condition. Similarly, a 20 percent decrease in body condition score would be associated with an additional 16 days to conception. This study reemphasized the relationship between weight loss during pregnancy and rebreeding performance. E...
متن کاملPuberty in beef bulls: acrosome morphology and semen quality in bulls of different breeds.
Semen characteristics were evaluated every 2 wk from 7 through 13 mo of age in 31 beef bulls representing six breed groups (Hereford, Angus, Hereford x Angus crossbreeds, Angus x Hereford crossbreds, Red Poll and Brown Swiss). Breeds differed in age at puberty, defined as the age at which an ejaculate was first obtained that contained a minimum of 50 x 10(6) total spermatozoa with at least 10% ...
متن کاملChanges 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...
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چکیده ندارد.
15 صفحه اولPuberty in beef bulls: hormone concentrations, growth, testicular development, sperm production and sexual aggressiveness in bulls of different breeds.
Postweaning growth and pubertal traits were studied in Hereford, Angus, Red Poll, Brown Swiss, Hereford-Angus crossbred (HXA) and Angus-Hereford crossbred (AX H) bulls from 7 through 13 months of age. Pubertal factors characterized included body weight, testicular size, hormone concentrations, sexual aggressiveness and sperm production. Puberty was defined as the age at which a bull first produ...
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ژورنال
عنوان ژورنال: Canadian Journal of Animal Science
سال: 1987
ISSN: 0008-3984,1918-1825
DOI: 10.4141/cjas87-068