Ultrasonographic and Other Testicular Characteristics of Holstein Bulls Revisited.
نویسندگان
چکیده
منابع مشابه
Immunohistochemical Localization of Ghrelin in Testicular Tissues of Holstein Bulls
Ghrelin, a 28-amino acid acylated peptide, was identified as the endogenous ligand for the growth hormone (GH) secretagogue receptor and its role in reproduction has recently been established. It is believed that the site of ghrelin expression in testes may indicate its role in local regulation. This study investigated the immunohistochemical (IHC) localization of ghrelin in Holstein bull testi...
متن کاملTesticular development and establishment of spermatogenesis in Holstein bulls.
Fifty-two Holstein bulls were castrated at 12, 16, 20, 24, 28 or 32 weeks to (1) determine whether testicular development is influenced by season of birth (April or October) and (2) examine quantitatively the establishment of spermatogenesis. Season of birth (spring or fall) did not influence (P less than .05) either testis weight at castration or the establishment of spermatogenesis. With age ...
متن کاملEffect of age on testicular growth and consistency of Holstein and Angus bulls.
A total of 5,909 scrotal circumference and 5,373 tesricular consistency (tonometer) measurements were made on Holstein bulls in seven artificial insemination studs. Comparable measurements were made on 339Angus bulls. The multiple regression equation, Y = -4.67 + 47.26 log X 1 1 . 7 4 (log X)2), where ~f is scrotal circumference in cm and X is bull age in months, described the high rate of test...
متن کاملRelationship of body weight to testicular size and consistency in growing Holstein bulls.
The relationship between 1,203 measurements of scrotal circumference and testicular consistency, usually made at 6-month intervals, and body weight in 411 Holstein bulls, primarily 6 to 72 months of age, were analyzed. All bulls were weighed within 14 days of testicular measurement. The relationship between body weight in kg (Y) and bull age in months (X) is described by the regression equation...
متن کاملPolymorphism and Sequencing of DGAT1 Gene in Iranian Holstein Bulls
Quantitative traits locus for milk production traits has been described on centromeric end of bovine chromosome 14. Reports name the acyl coA: diacylglycerol acyltransferase (DGAT1) gene as a potential candidate gene with dinucleotide substitution (AA to GC) in exon VIII which causes the change of lysine to alanine in amino acid (K232A).The aim of the present study was to estimate the frequency...
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ژورنال
عنوان ژورنال: Journal of Reproduction and Development
سال: 1999
ISSN: 0916-8818,1348-4400
DOI: 10.1262/jrd.45.405