Although a number of recent studies have focused on the existence of a non-negligible sire contemporary group interaction effect (s) affecting the estimation of genetic parameters for maternally influenced traits in beef cattle, the assessment and interpretation of this effect using field data remains poorly understood. In this study 27,639 records of both birth weight (BW) and weaning weight (...

Heritabilities of and genetic, envicovariance components. Estimates of heritability ronmental, and phenotypic correlations among were .39 (WCa), .40 (WP), .36 (WMg), and .35 (WW). serum amounts of calcium, phosphorus, and magEstimates of genetic, environmental, and phenonesium and weight at weaning (WCa, WP, WMg, typic correlations were .66, .55, .57 (WCa, WP), .70, and WW, respectively) were e...

The aim of this study was to estimate genetic parameters for BW of Angus cattle up to 5 yr of age and to discuss options for including mature weight (MW) in their genetic evaluation. Data were obtained from the American Angus Association. Only records from herds with at least 500 animals and with >10% of animals with BW at ≥ 2 yr of age were considered. Traits were weaning weight (WW, n = 81,52...

We aimed to evaluate the effects of sex and linear quadratic components age dam at calving, as well apply a mixed model including maternal effect for genetic evaluation weaning (WW) yearling (YW) weights. The phenotypic database was composed by Charolais, Caracu, Aberdeen Angus, Canchim purebred crossbred animals. Single-trait analyses were performed using models that included WW YW traits, ign...

This study aimed to assess the impact of climatic variability on growth performance Fogera cattle at Metekel breeding and multiplication ranch. About 15-years meteorological data were collected from National Meteorological Agency. Then, heat stress (HS) condition ranch location was calculated by temperature-humidity index (THI). Moreover, all animals born calves that weaned 2005 2019 included i...

Records (2,910) of birth (BWT), weaning (WW), and yearling weight (YW) of F1 calves produced in a top-cross experiment involving Angus, Hereford, Pooled Hereford, Charolais, Limousin, Simmental, Gelbvieh, Maine-Anjou, Chianina, Tarentaise, Shorthorn, and Salers bulls mated to Hereford and Angus cows and records (4,592) of WW on three-breed-cross calves out of 986 F1 females of the same breed cr...

Heritabilities and genetic correlations between weaning weight (WW) and average daily gain (ADG) for the Hungarian Merino, Ile de France, Charollais, German Mutton Merino, German Blackheaded, Texel, Fleisch Merino and Suffolk were studied. The selection of replacements is based on the two traits. The amount of records provided by the Hungarian Sheep Breeder’s Association and by the Hungarian Ag...

Growth records of 4,270 weanling rabbits born between March 1985 and December 1989 were studied to evaluate the effects of breed and month of birth on postweaning growth performance of four medium-sized breeds. Californian (CAL), New Zealand White (NZW), Palomino (PAL), and White Satin (WS). Traits examined were 28-d weaning weight (WW), postweaning gain (GAIN), attainment of 1,600-g market wei...

Records of birth weight (BW), weaning weight (WW) and condition score (CS) from 1,467 Brahman and Brahman X Angus crossbred calves from Brahman and crossbred Brahman sires and Brahman, crossbred Brahman and Angus dams were collected at the Subtropical Agricultural Research Station, Brooksville, Florida, from 1971 to 1982. Best linear unbiased estimates (BLUE) of Brahman sire and dam group addit...

Temperament is an important trait for the management and welfare of animals and for reducing accidents involving people who work with cattle. The present study aimed to estimate the genetic parameters related to the temperament score (T) and weaning weight (WW) of Nellore cattle, reared in a beef cattle breeding program in Brazil. Data were analyzed using two different two-trait statistical mod...