Replacement Heifer Selection in A Beef Cattle Herd
نویسندگان
چکیده
منابع مشابه
Genetic 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 کاملSire x herd interactions for weaning weight in beef cattle.
Weaning weight records of 44,357 Australian Angus calves produced by 1,020 sires in 90 herds were used to evaluate the importance of sire x herd interactions. Models fitted fixed effects of contemporary group (herd-year-date of weighing subclass), sex, calf age, and dam age and random effects of sire or of sire and sire x herd interaction using REML. Effects of standardizing the data, including...
متن کاملRuminant Nutrition: Growing Cattle and Beef Breeding Herd
Data from an experiment utilizing 78 individually fed heifers (407 ± 32 kg) were used to determine relationships of G: F and residual feed intake (RFI) to metabolizable protein balance (MPB), purine derivative excretion to creatinine excretion (PD:C) and 3-methyl histidine excretion to creatinine excretion(3MH:C). Heifers were fed steam-flaked corn based diets containing either 0 (NEG) or 1.5% ...
متن کاملReplacement Heifer Development
segment of the integrated management program in an efficient beef cow production system. The main objective should be to develop an adequate number of heifers to a point where they reach puberty and are cycling regularly at the start of the breeding season. In addition, they should have adequate pelvic area to deliver a reasonable size calf unassisted. Because of her increased nutritional needs...
متن کاملEvaluation and Selection of Beef Cattle
In former times, selections in beef cattle were based on conformation alone. Today increased costs of production, competition from other feedstuffs and current exponential growth rates of human populations suggest that while energetic efficiency and volume of production are not the sole over-riding factors in beef cattle production, they are becoming increasingly important. The time has come wh...
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ژورنال
عنوان ژورنال: American Journal of Applied Sciences
سال: 2005
ISSN: 1546-9239
DOI: 10.3844/ajassp.2005.542.544