Induction of oestrus with norgestomet in acyclic post-pubertal Holstein heifers

• Autorzy: Cetin Y , Uslu B.A. , Gungor O. , Sendag S.
• Języki publikacji: EN

Abstrakty

EN

The study was carried out during April and May 2006, on thirty-eight 15 - 23-month-old Holstein heifers with inactive ovaries, which were selected from a private dairy herd with 300 heifers. The heifers were randomly distributed into two groups: norgestomet group (n=29), and a control group (n=9). In the norgestomet group, silicone ear implants containing 6 mg of norgestomet were implanted, and a solution containing 3 mg of norgestomet and 5 mg of oestradiol valerate was injected intramuscularly. The silicone implants were removed 11 d later, and the heifers were continuously observed for signs of oestrus for three days. The heifers were inseminated 48 and 78 h after the removal of the implants, and after the first insemination they were treated with 50 µg of GnRH analogue. The rate of the induced oestrus was 86.2% (25/29) and 0% (0/9) in norgestomet and control groups, respectively. The pregnancy rate was 48.2% (14/29) and 0% (0/9) in norgestomet and control groups, respectively. Our results showed that fertile oestrus can be stimulated successfully in post-pubertal heifers with inactive ovaries by a norgestomet treatment, and-successful pregnancy rate can be obtained by a fixed-time insemination during this oestrus.

Słowa kluczowe

EN

inactive ovary; insemination; oestrus synchronization; ovary; norgestomet treatment; pregnancy rate; norgestomet; heifer; Holstein heifer

• Wydawca: -
• Czasopismo: Bulletin of the Veterinary Institute in Puławy
• Rocznik: 2007
• Tom: 51
• Numer: 2
• Opis fizyczny: p.247-251,ref.

Twórcy

autor

Cetin Y

• University of Yuzuncu Yil, 65080 Van, Turkey

autor

Uslu B.A.

autor

Gungor O.

autor

Sendag S.

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