Relationships among body condition score, milk yield and sires' breeding value for beef production efficiency in Czech Fleckvieh cattle

Abstract

ABSTRACT:The objective of this study was to analyze the relationships among cows' body condition score before calving, subsequent BCS changes, milk yield, lactation characteristics and their sires' relative breeding value for net daily gain. Increasing the relative breeding value of net daily gain in the sires was associated with increased BCS in their daughters. The differences ranged between 0.02 and 0.18 points in the particular lactation periods, but they were not statistically significant. The group of cows with the highest BCS before calving showed the highest BCS decrease (-0.25 points) after calving (P < 0.01); the BCS loss lasted for 3 months. The analysis of the relationship between the relative breeding value of sires for net daily gain and milk yield of their daughters showed a negative effect of RBV NG ≤ 89 on the daughters' milk yield (P < 0.05), while the negative differences were up to -279.12 kg of fat-protein corrected milk. The effect of this trait on the lactation curve was also analyzed.

Reduction of traits for genetic evaluation of linear described traits in the Old Kladruber horse

“…The population was closed against gene immigration from related breeds of Old Spanish origin in 1992. Due to imperial tradition, the breed consists of a grey and a black variety.A linear-type description is routinely used mainly in cattle, where a number of analyses were pre-formed (Brothostone, 1994;Veselá et al, 2005;Bouška et al, 2008). Body conformation in the horse was evaluated first by a scoring system, while a linear-type description was introduced later.…”

“…A linear-type description is routinely used mainly in cattle, where a number of analyses were pre-formed (Brothostone, 1994;Veselá et al, 2005;Bouška et al, 2008). Body conformation in the horse was evaluated first by a scoring system, while a linear-type description was introduced later.…”