Evaluation of Reproduction Traits in Selected Breeding Herds of Slovak Simmental Dairy Cows by Breeding Type

Jozef Bujko, Juraj Candrák, Peter Strapák, Július Žitný, Cyril Hrnčár

Abstract


Female fertility is a complex trait. It is affected by different factors for example nutrition, breeding conditions and season of calving, time to first heat and milk production. The aim this work was analyse reproduction traits in selected breeding herds Slovak Simmental dairy cows in the period 2012 to 2016 by breeding type (S0, S1, S2) the results for dairy cows: days to first service (DFS), days open (DO), number of inseminations per conception (NIC) and calving interval (CI). The basic statistical analysis were analysed using the SAS version 9.3 (TS1M2) Enterprise Guide 5.1. For the actual computation a linear model with fixed effects was used: yijklm = μ + HYSi + bj + ck + eijkl, where: μ = mean value, HYSi = effect of herd, year and season of calving (1 - 604), bj = sire (1 - 192), ck = effect of bull (1 - 119), eijkl = residual error.The basic traits of reproduction traits (DFS, DO, NIC, CI) in selected breeding herds Slovak Simmental dairy cows were 78.55 ± 55.48 days, 120.83 ± 84.01 days, 407.02 ± 90.49 and 2.14 ± 1.61 days for S0,  78.62 ± 54.0 days, 124.82 ± 89.26 days, 408.76 ± 97.26 and 2.04 ± 1.39 days for S1, and 80.99 ± 69.04 days, 124.07 ± 93.73.days, 410.90 ± 89.41and 2.20 ± 1.58 days for S2. The linear model to represent coefficient determination R2 = 0.482750 % for days to first service (DFS), R2 = 0.435010 % for days open (DO), R2 = 0.345971 % for number of inseminations per conception (NIC) and R2 = 0.482750 % calving interval (CI) with all fixed effects. The analyses by the effect were the highest effect of herd -year - season of calving (HYS) than effect of sire. These effects were statistically high significant (P<0.0001). Supported by the Scientific Grant Agency of the Ministry of Education, Science, Research and Sport of the Slovak Republic and the Slovak Academy of Sciences (VEGA) (Project No. 1/0742/17).


Keywords


Slovak Simmental cattle, dairy cows, reproduction traits, breeding type, coefficients of determination, correlations

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