The ovine melatonin receptor 1A (MTNR1A) and aromatase (CYP19) genes were structurally characterized and the association between their variants and reproductive and growth traits was studied in Kurdi sheep at Kurdi sheep breeding station located in Shirvan, Iran. The genomic DNA was extracted by guanidine thiocyanate-silica gel method. Polymerase chain reaction was carried out to amplify 824 bp...

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 (...

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...

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...

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 ovine melatonin receptor 1a (mtnr1a) and aromatase (cyp19) genes were structurally characterized and the association between their variants and reproductive and growth traits was studied in kurdi sheep at kurdi sheep breeding station located in shirvan, iran. the genomic dna was extracted by guanidine thiocyanate-silica gel method. polymerase chain reaction was carried out to amplify 824 bp...

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...