Methodology for adjusting scrotal circumference to 365 or 452 days of age and correlations of scrotal circumference with growth traits in beef bulls

A retrospective analysis was conducted on data collected from 1983 through 1991, where weight and hip height were measured at start of test and every 28 d on 604 bulls completing a 224-d forage-based gain test. Scrotal circumference (SC) was measured at start of test, and at either end of test or en...

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Bibliographic Details
Published in:Theriogenology 1996-09, Vol.46 (4), p.659-669
Main Authors: Bell, D.J., Spitzer, J.C., Bridges, W.C., Olson, L.W.
Format: Article
Language:English
Subjects:
AGE
ALTURA
beef bulls
BOVIN DE BOUCHERIE
DIFERENCIAS BIOLOGICAS
DIFFERENCE BIOLOGIQUE
EDAD
ESCROTO
FENOTIPOS
GAIN DE POIDS
GANADO DE CARNE
GANANCIA DE PESO
growth
HAUTEUR
INDICE DE CRECIMIENTO
MADRE
MATEMATICAS
MATHEMATIQUE
MEDICION DEL CUERPO
MEMBRE
MENSURATION CORPORELLE
MERE
MIEMBROS
PESO
PESO AL NACIMIENTO
PHENOTYPE
POIDS
POIDS A LA NAISSANCE
RACE (ANIMAL)
RAZAS (ANIMALES)
reproduction
scrotal circumference
SCROTUM
TAUREAU
TAUX DE CROISSANCE
TORO
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Summary:A retrospective analysis was conducted on data collected from 1983 through 1991, where weight and hip height were measured at start of test and every 28 d on 604 bulls completing a 224-d forage-based gain test. Scrotal circumference (SC) was measured at start of test, and at either end of test or end of the weigh period after individual bulls reached 365 d of age. Over 3 yr of this study, SC was additionally measured every 28 d. Bulls were representatives of 5 breed groups: Angus, Santa Gertrudis, Simmental, Continental (predominantly Charolais), and Zebu (predominantly Simbrah). Adjusted 365-d SC and adjusted 452-d SC were calculated by regression analysis and from formulas based on SC growth of individuals to 140 and 224 d on test, respectively. Breed group differences were observed for age of dam, birth weight, hip height, weight per day of age, average daily gain and SC at start of test, 140 d, and end of test (224 d). Scrotal circumference was positively correlated with all growth traits. Scrotal circumference was related to breed group, age, weight, hip height, average daily gain, weight per day of age, age by year, and age-by-breed group (P
ISSN:0093-691X
1879-3231
DOI:10.1016/0093-691X(96)00217-8