منابع مشابه
Evaluation of Crossbreeding Systems for Preweaning Traits in Beef Cattle
SUMMARY four-generation crossbreeding experiment with Hereford, Angus a from a tt1e were analyzed. Individual, maternal, and grand-maternal rthorn c: rotic effects on the composite trait of calf weight weaned per I e and h\~eeding and its component traits were evaluated. The parameter e."osed to then used to project performance at equ i 1 i bri urn under rotat i on teS ~ere The average of two-b...
متن کاملMaternal heterosis and grandmaternal effects in beef cattle: preweaning traits.
Crossbred progeny from females, 3 yr old and older, representing Brown Swiss (B), Red Poll (R), Hereford (H) and Angus (A) maternal grandsires and maternal granddams in a diallel crossing experiment were evaluated to estimate breed mean maternal heterosis (mean hMi) for each breed, maternal heterosis for specific breed cross females (hMij), average maternal heterosis for all crosses (mean hM) a...
متن کاملPreweaning growth rate and weaning traits of Angus, zebu and zebu-cross cattle.
A 4-yr study was conducted on the preweaning growth rate and weaning traits of 620 calves from: (1) Angus (A), Brahman (B), Brangus (BR) and Africander-Angus (AF) dams sired by A and B bulls; (2) BR dams mated to BR sires and (3) AF dams mated to AF sires. Heifers were placed in the breeding pastures as 2-yr-olds and exposed to bulls for 75 d. Breed groups differed (P less than .01) in weaning ...
متن کاملenetic analysis of calf survival at different preweaning ages in beef cattle
The aim of this paper is to assess the suitability of including calf survival traits in the breeding objective of beef cattle improvement programs. To do so, we analysed the genetic parameters affecting calf survival during the perinatal period (PS), between the perinatal period and weaning (LM) and at weaning (WS) using Asturiana de los Valles breed field data. Up to 36 125 calf survival recor...
متن کاملGenetic parameter estimates for preweaning growth traits in Santa Gertrudis cattle.
Genetic parameters were estimated for birth weight and weaning weight from records collected on 1,894 Santa Gertrudis calves (939 bulls, 955 heifers) during the 8-yr period, 1978 through 1985. Variance and covariance components were estimated separately by sex and combined across sexes utilizing mixed-model, least-squares procedures (Henderson's Method 3). The mathematical model assumed for est...
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ژورنال
عنوان ژورنال: Nigerian Journal of Animal Production
سال: 2021
ISSN: 0331-2062
DOI: 10.51791/njap.v3i2.2521