Estimates of Genetic and Environmental (Co)Variances for 305-Day Milk Yield and Calving Intervals in Holstein Fresian Cattle

Zafer ULUTAŞ

Article Details

Estimates of Genetic and Environmental (Co)Variances for 305-Day Milk Yield and Calving Intervals in Holstein Fresian Cattle

Authors:

Zafer ULUTAŞ

Publisher:

TUBITAK

Journal:

Turkish Journal of Veterinary and Animal Sciences 2004 Vol.28 Issue 1, pp.101-105

Document Type:

Article

Publication Date:

12/2003

Document Language:

Turkish

Document ID (Org No.):

2000769672

Frequency:

Bimonthly

eISSN:

1303-6181

pISSN:

1300-0128

Keywords:

Abstract:

 

In this study, the data consist of 305-day milk yield, calving intervals and pedigree information regarding Holstein cows raised on the Gelemen state farm and calved between 1982 and 1997. Estimates of genetic parameters and variance components of 305-day milk yield and calving intervals were obtained by restricted maximum likelihood analyses fitting an animal model. Heritabilities of milk yield and calving intervals were 0.16 ± 0.055 and 0.058 ± 0.0436, and the replications of the same traits were 0.35 ± 0.031 and 0.058 ± 0.040, respectively. While the genetic correlation between 305-day milk yield and calving intervals was high (0.69 ± 0.300), phenotypic correlation was rather low (0.18 ± 0.033). High, positive correlation between 305-day milk yield and calving intervals was interpreted as an increase in 305-day milk yield causing a decrease in calf number per time unit.

 

In this study, the data consist of 305-day milk yield, calving intervals and pedigree information regarding Holstein cows raised on the Gelemen state farm and calved between 1982 and 1997. Estimates of genetic parameters and variance components of 305-day milk yield and calving intervals were obtained by restricted maximum likelihood analyses fitting an animal model. Heritabilities of milk yield and calving intervals were 0.16 ± 0.055 and 0.058 ± 0.0436, and the replications of the same traits were 0.35 ± 0.031 and 0.058 ± 0.040, respectively. While the genetic correlation between 305-day milk yield and calving intervals was high (0.69 ± 0.300), phenotypic correlation was rather low (0.18 ± 0.033). High, positive correlation between 305-day milk yield and calving intervals was interpreted as an increase in 305-day milk yield causing a decrease in calf number per time unit.

Article Details

Estimates of Genetic and Environmental (Co)Variances for 305-Day Milk Yield and Calving Intervals in Holstein Fresian Cattle

Authors:

Zafer ULUTAŞ

Publisher:

TUBITAK

Journal:

Turkish Journal of Veterinary and Animal Sciences 2004 Vol.28 Issue 1, pp.101-105

Document Type:

Article

Publication Date:

12/2003

Document Language:

Turkish

Document ID (Org No.):

2000769672

Frequency:

Bimonthly

eISSN:

1303-6181

pISSN:

1300-0128

Genetic parameter

calving intervals

305-day milk yield

Holstein-Friesian

Issues

Article Details

Estimates of Genetic and Environmental (Co)Variances for 305-Day Milk Yield and Calving Intervals in Holstein Fresian Cattle

Authors: Zafer ULUTAŞ

Publisher: TUBITAK

Journal: Turkish Journal of Veterinary and Animal Sciences 2004 Vol.28 Issue 1, pp.101-105

Document Type: Article

Publication Date: 12/2003

Document Language: Turkish

Document ID (Org No.): 2000769672

Frequency: Bimonthly

eISSN: 1303-6181

pISSN: 1300-0128

Genetic parameter

calving intervals

305-day milk yield

Holstein-Friesian

Issues

Authors:

Zafer ULUTAŞ

Publisher:

TUBITAK

Journal:

Turkish Journal of Veterinary and Animal Sciences 2004 Vol.28 Issue 1, pp.101-105

Document Type:

Article

Publication Date:

12/2003

Document Language:

Turkish

Document ID (Org No.):

2000769672

Frequency:

Bimonthly

eISSN:

1303-6181

pISSN:

1300-0128