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Effect of temperament on performance of primiparous dairy cows

100%

Sawa A., Bogucki M., Neja W., Krezel-Czopek S.

Annals of Animal Science

2017

tom 17

nr 3

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Influence of cow temperament and milking speed on herd life, lifetime milk yield and reasons of cow culling

84%

Kalinska A., Slosarz J.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

2016

tom 55[2]

Influence of cow temperament and milking speed on herd life, lifetime milk yield and reasons of cow culling.Importance of functional traits, longevity or reproduction traits increases continuously in present dairy cattle breeding. Effects of milking speed and cow temperament on herd life, lifetime milk yield and reasons of culling were estimated. The highest lifetime yield (p<0.01) of milk, fat and protein as well as life span and herd life had calm animals or slow milking cows. However, cows with normal temperament or fast milking had the highest (p<0.01) yield of milk fat and protein per one day of utilization. The main reason of culling were fertility and reproductive disorders (on average 41.2%), but 15.3% cows were culled because of udder diseases. Results suggest highly significant (p<0.01) influence of temperament and milking speed on life span, herd life, lifetime milk yield. Functional traits, longevity or fertility should be parts of breeding programs to balance dairy cattle selection and compensate negative influence of selection only towards milk yield that took place in the past.

Investigation of major gene for milk yield, milking speed, dry matter intake, and body weight in dairy cattle

67%

Karacaoren B., Kadarmideen H. N., Janss L. L. G.

Journal of Applied Genetics

2006

tom 47

nr 4

The main aim of this study was to determine if there exist any major gene for milk yield (MY), milking speed (MS), dry matter intake (DMI), and body weight (BW) recorded at various stages of lactation in first-lactation dairy cows (2543 observations from 320 cows) kept at the research farm of the Swiss Federal Institute of Technology between April 1994 and April 2004. Data were modelled based a simple repeatability covariance structure and analysed by using Bayesian segregation analyses. Gibbs sampling was used to make statistical inferences on posterior distributions; inferences were based on a single run of the Markov chain for each trait with 500 000 samples, with each 10th sample collected because of the high correlation among the samples. The posterior mean (±SD) of major gene variance was 2.61 (±2.46) for MY, 0.83 (±1.26) for MS, 4.37 (±2.34) for DMI, and 2056.43 (±665.67) for ВW. Highest posterior density regions for 3 of the 4 traits did not include 0 (except MS), which supported the evidence for major gene. With additional tests for agreement with Mendelian transmission probabilities, we could only confirm the existence of a major gene for MY, but not for MS, DMI, and BW. Expected Mendelian transmission probabilities and their model fits were also compared.

Ograniczanie wyników

1 Annals of Animal Science

1 Annals of Warsaw University of Life Sciences - SGGW. Animal Science

1 Journal of Applied Genetics

1 Bogucki M.

1 Janss L. L. G.

1 Kadarmideen H. N.

1 Kalinska A.

1 Karacaoren B.

1 Krezel-Czopek S.

1 Neja W.

1 Sawa A.

1 Slosarz J.

1 2017

1 2016

1 2006

Wyniki wyszukiwania

Effect of temperament on performance of primiparous dairy cows

Influence of cow temperament and milking speed on herd life, lifetime milk yield and reasons of cow culling

Investigation of major gene for milk yield, milking speed, dry matter intake, and body weight in dairy cattle