Reproductive Performance and  Synchronization of the Ovulation and Estrus in Brown Swiss Cows and Heifers Using the Protocol GnRH- PGF2 alpha-GnRH and PGF2 alpha

Faruk ARAL

Makale detayları

Reproductive Performance and Synchronization of the Ovulation and Estrus in Brown Swiss Cows and Heifers Using the Protocol GnRH- PGF2 alpha-GnRH and PGF2 alpha

Yazarlar:

Faruk ARAL

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Veterinary and Animal Sciences 2004 Vol.28 Issue 1, pp.179-184

Belge Tipi:

Makale

Yayın Tarihi:

12/2003

Belge Dili:

Türkçe

Document ID (Org No.):

2000769702

Sıklık:

İki Aylık

eISSN:

1303-6181

pISSN:

1300-0128

Anahtar kelimeler:

Özet:

 

The objective was to compare the reproductive performances of Brown Swiss cows and heifers synchronized for estrus and ovulation using prostaglandin F 2 alpha (PGF2a) alone or with gonadotropin-releasing hormone (GnRH). Primiparous and multiparous cows (45 to 75 days postpartum; n = 26) and nulliparous heifers (16 to 20 months; n = 26) were randomly assigned to 2 treatment programs. GnRH injection was followed in 7 days by  PGF2a  injection and then by another GnRH injection 9 days later. Artificial insemination (AI) was performed 16 h after the second GnRH injection. Injections of PGF2a were given 11 days apart AI was only carried out after estrus was detected following the first and second PGF2a injections or, timed AI in the absence of detected estrus was carried out 72 h after the second  PGF2a  injection. The conception rate in first insemination, pregnancy rate and the interval from PGF2a  to estrus were not different between the 2 groups. However, the estrus detection rate was greater for the group II cows (61.5%) than for the group I cows (15.4%) (P < 0.05). Pregnancy rates tended to be higher in group I cows. The GnRH-PGF2a -GnRH method allowed effective management of AI in cows and heifers without the need for estrus detection.

 

The objective was to compare the reproductive performances of Brown Swiss cows and heifers synchronized for estrus and ovulation using prostaglandin F 2 alpha (PGF2a) alone or with gonadotropin-releasing hormone (GnRH). Primiparous and multiparous cows (45 to 75 days postpartum; n = 26) and nulliparous heifers (16 to 20 months; n = 26) were randomly assigned to 2 treatment programs. GnRH injection was followed in 7 days by  PGF2a  injection and then by another GnRH injection 9 days later. Artificial insemination (AI) was performed 16 h after the second GnRH injection. Injections of PGF2a were given 11 days apart AI was only carried out after estrus was detected following the first and second PGF2a injections or, timed AI in the absence of detected estrus was carried out 72 h after the second  PGF2a  injection. The conception rate in first insemination, pregnancy rate and the interval from PGF2a  to estrus were not different between the 2 groups. However, the estrus detection rate was greater for the group II cows (61.5%) than for the group I cows (15.4%) (P < 0.05). Pregnancy rates tended to be higher in group I cows. The GnRH-PGF2a -GnRH method allowed effective management of AI in cows and heifers without the need for estrus detection.

Makale detayları

Reproductive Performance and Synchronization of the Ovulation and Estrus in Brown Swiss Cows and Heifers Using the Protocol GnRH- PGF2 alpha-GnRH and PGF2 alpha

Yazarlar:

Faruk ARAL

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Veterinary and Animal Sciences 2004 Vol.28 Issue 1, pp.179-184

Belge Tipi:

Makale

Yayın Tarihi:

12/2003

Belge Dili:

Türkçe

Document ID (Org No.):

2000769702

Sıklık:

İki Aylık

eISSN:

1303-6181

pISSN:

1300-0128

Dairy cattle

synchronization of estrus

synchronization of ovulation

gonadotropin-releasing hormone

prostaglandin F2a

Sayı

Makale detayları

Reproductive Performance and Synchronization of the Ovulation and Estrus in Brown Swiss Cows and Heifers Using the Protocol GnRH- PGF2 alpha-GnRH and PGF2 alpha

Yazarlar: Faruk ARAL

Yayıncı: TUBITAK

Dergi: Turkish Journal of Veterinary and Animal Sciences 2004 Vol.28 Issue 1, pp.179-184

Belge Tipi: Makale

Yayın Tarihi: 12/2003

Belge Dili: Türkçe

Document ID (Org No.): 2000769702

Sıklık: İki Aylık

eISSN: 1303-6181

pISSN: 1300-0128

Dairy cattle

synchronization of estrus

synchronization of ovulation

gonadotropin-releasing hormone

prostaglandin F2a

Sayı

Yazarlar:

Faruk ARAL

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Veterinary and Animal Sciences 2004 Vol.28 Issue 1, pp.179-184

Belge Tipi:

Makale

Yayın Tarihi:

12/2003

Belge Dili:

Türkçe

Document ID (Org No.):

2000769702

Sıklık:

İki Aylık

eISSN:

1303-6181

pISSN:

1300-0128