Genetics of heifer puberty in two tropical beef genotypes in northern Australia and associations with heifer- and steer-production traits
نویسندگان
چکیده
منابع مشابه
Interrelationships of heifer milk production and other biological traits with production efficiency to weaning.
Interrelationships among milk production, dam-calf feed efficiency to weaning, and other biological traits were evaluated on 411 first-calf heifers and their calves. Individual feed intakes were measured in a drylot environment for a 1-yr period until weaning of the first calf. Heifer breed types included crossbred Angus-Hereford, Simmental-Hereford, and Tarentaise-Hereford produced in two-bree...
متن کاملGenetic Improvement of Heifer Pregnancy and Performance in Beef Cattle
Current genetic improvement programs should place more emphasis on improving profitability than on one or a small group of traits, under the framework of economic relevance (Golden et al., 2000). When profit is defined generally as revenue minus cost, true economically relevant traits (ERT) have a direct impact on either income or expenses, whereas indicator traits provide a means to increase a...
متن کاملGenetics of meat quality and carcass traits and the impact of tenderstretching in two tropical beef genotypes
Meat quality and carcass traits were measured for 2180 feedlot finished Brahman (BRAH) and Tropical Composite (TCOMP) steers to investigate genetic and non-genetic influences on shear force, and other meat quality traits. Genetic and phenotypic correlations were estimated between carcass and meat quality traits, and with live animal measurements collected in steers from weaning to feedlot exit,...
متن کاملcomparison of the amount of debris extruded apically in two rotary techniques: flexmaster and m2
چکیده ندارد.
15 صفحه اولBeef heifer development within three calving systems.
A 3-yr study was conducted to evaluate the effects of calving system, weaning age, and postweaning management on growth and reproduction in beef heifers. Heifer calves (n = 676) born in late winter (average birth date = February 7 +/- 9 d) or early spring (average birth date April 3 +/- 10 d) were weaned at 190 or 240 d of age, and heifers born in late spring (average birth date May 29 +/- 10 d...
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ژورنال
عنوان ژورنال: Animal Production Science
سال: 2009
ISSN: 1836-0939
DOI: 10.1071/ea08276