The goal of this study was to estimate economic values for feed efficiency (FE), resilience (RE), adaptability (AD), and disease resistance (DR). indicator traits that were used measure; FE, RE, AD DR residual intake (RFI), variance deviations in milk yield, heat stress using reduction due an increase temperature humidity index (THI) by 1 brucellosis resistance, respectively. A bio-economic mod...

In this study 495 smallholder dairy farms in 52 villages of different township in southwestern province of Iran (Chaharmohal and Bakhtiari province) included 1321 lactating cows and 2811 total mature cows (lactating and dry) during winter 2009 to summer 2010 were used to estimate economic opportunities insmallholder dairy farms. Questionnaire survey was used to collect data from last year infor...

An association analysis between T19C polymorphism in bovine PPARGC1A and productive and reproductive traits was performed in a population of 620 and 279 Polish Holstein-Friesian cows, respectively. No relationship was found with milk yield and composition. PPARGC1A genotypes had, however, a significant effect on lengths of calving interval and calving to conception interval, and the T allele wa...

New maternal breeding values have been developed for use in UK beef evaluations. To undertake multitrait BLUP evaluations, it is necessary to have a full covariance matrix. This study outlines the approach taken to construct the full covariance matrices for the four beef breeds that most widely contribute to suckler beef cows in the United Kingdom. The maternal traits investigated were age at f...

The aim of this study was to calculate the calving interval and reproductive efficiency by effect parity in a dual-purpose herd Mexican tropics. prospective observational cows´ records from year 2013 2021 analyzed. with pathology non 50% Bos indicus taurus were taken out. In total, 67 intervals between 24 cows gotten farm genotypes (Gyr) genes remaining came Holstein, Fleckvieh, Brown Swiss. A ...