Effect of Certain Factors on Productive and Reproductive Efficiency Traits and Phenotypic Relationships Among These Traits and Repeatabilities in West Anatolian Holsteins

Mustafa TEKERLİ

Makale detayları

Effect of Certain Factors on Productive and Reproductive Efficiency Traits and Phenotypic Relationships Among These Traits and Repeatabilities in West Anatolian Holsteins

Yazarlar:

Mustafa TEKERLİ

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Veterinary and Animal Sciences 2005 Vol.29 Issue 1, pp.17-22

Belge Tipi:

Makale

Yayın Tarihi:

12/2004

Belge Dili:

Türkçe

Document ID (Org No.):

2000769172

Sıklık:

İki Aylık

eISSN:

1303-6181

pISSN:

1300-0128

Anahtar kelimeler:

Özet:

 

The present investigation was undertaken to study certain factors affecting production efficiency, milk production and reproduction and to estimate the repeatabilities and phenotypic correlations of these traits in Holsteins maintained at different farms in western Anatolia over 3 years (1990 - 1993). The data consisted of 506 first and 232 second lactations of  525 cows. Three production efficiency traits (milk yield per day of lactation length (MYPDLL), milk yield per day of calving interval (MYPDCI) and milk yield per day of age at second calving (MYPDASC)), one production trait (lactation yield (LY)), and one reproduction trait (calving interval (CI))  were studied. The means of MYPDLL, MYPDCI, MYPDASC, LY and CI were 19.04 kg, 15.44 kg, 4.91 kg, 6404.77 kg, and 418.86 days, respectively.   The analyses of variance indicated that the effects of the region-year factor were significant (P < 0.05) for all traits, whereas none of the traits was influenced by the parity order. The calving months were significant (P < 0.05) for  MYPDASC, LY and CI. Least-squares means illustrated that these traits were lower for summer calvers. Age also had an important effect (P < 0.05) on MYPDLL, MYPDCI and LY. The positive phenotypic correlation (0.55) between milk yield and calving interval suggested that the higher yielding cows had longer calving intervals. Fertility was also severely depressed when the lactation yield  was  higher than 7000 kg. The repeatabilities for MYPDLL (0.51), MYPDCI (0.41) and LY (0.43) were high, and low for calving interval (0.10).

 

The present investigation was undertaken to study certain factors affecting production efficiency, milk production and reproduction and to estimate the repeatabilities and phenotypic correlations of these traits in Holsteins maintained at different farms in western Anatolia over 3 years (1990 - 1993). The data consisted of 506 first and 232 second lactations of  525 cows. Three production efficiency traits (milk yield per day of lactation length (MYPDLL), milk yield per day of calving interval (MYPDCI) and milk yield per day of age at second calving (MYPDASC)), one production trait (lactation yield (LY)), and one reproduction trait (calving interval (CI))  were studied. The means of MYPDLL, MYPDCI, MYPDASC, LY and CI were 19.04 kg, 15.44 kg, 4.91 kg, 6404.77 kg, and 418.86 days, respectively.   The analyses of variance indicated that the effects of the region-year factor were significant (P < 0.05) for all traits, whereas none of the traits was influenced by the parity order. The calving months were significant (P < 0.05) for  MYPDASC, LY and CI. Least-squares means illustrated that these traits were lower for summer calvers. Age also had an important effect (P < 0.05) on MYPDLL, MYPDCI and LY. The positive phenotypic correlation (0.55) between milk yield and calving interval suggested that the higher yielding cows had longer calving intervals. Fertility was also severely depressed when the lactation yield  was  higher than 7000 kg. The repeatabilities for MYPDLL (0.51), MYPDCI (0.41) and LY (0.43) were high, and low for calving interval (0.10).

Makale detayları

Effect of Certain Factors on Productive and Reproductive Efficiency Traits and Phenotypic Relationships Among These Traits and Repeatabilities in West Anatolian Holsteins

Yazarlar:

Mustafa TEKERLİ

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Veterinary and Animal Sciences 2005 Vol.29 Issue 1, pp.17-22

Belge Tipi:

Makale

Yayın Tarihi:

12/2004

Belge Dili:

Türkçe

Document ID (Org No.):

2000769172

Sıklık:

İki Aylık

eISSN:

1303-6181

pISSN:

1300-0128

Milk production

production efficiency

reproduction

phenotypic correlation

repeatability

Holstein

Sayı

Makale detayları

Effect of Certain Factors on Productive and Reproductive Efficiency Traits and Phenotypic Relationships Among These Traits and Repeatabilities in West Anatolian Holsteins

Yazarlar: Mustafa TEKERLİ

Yayıncı: TUBITAK

Dergi: Turkish Journal of Veterinary and Animal Sciences 2005 Vol.29 Issue 1, pp.17-22

Belge Tipi: Makale

Yayın Tarihi: 12/2004

Belge Dili: Türkçe

Document ID (Org No.): 2000769172

Sıklık: İki Aylık

eISSN: 1303-6181

pISSN: 1300-0128

Milk production

production efficiency

reproduction

phenotypic correlation

repeatability

Holstein

Sayı

Yazarlar:

Mustafa TEKERLİ

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Veterinary and Animal Sciences 2005 Vol.29 Issue 1, pp.17-22

Belge Tipi:

Makale

Yayın Tarihi:

12/2004

Belge Dili:

Türkçe

Document ID (Org No.):

2000769172

Sıklık:

İki Aylık

eISSN:

1303-6181

pISSN:

1300-0128