The Effect Methodology of FSH Injection on The Ovulation Rates of Dairy Cattle



P. Situmorang(1*), A.M Lubis(2), E. Triwulaningsih(3)

(1) Research Institute for Animal Production P.0 Box 221. Bogor. Indonesia.
(2) Research Institute for Animal Production P.0 Box 221. Bogor. Indonesia.
(3) Research Institute for Animal Production P.0 Box 221. Bogor. Indonesia.
(*) Corresponding Author

Abstract


The effect methodology of FSH injection on the ovulation rates of dairy cattle was
study. Thirteen lactating cows with body weight between 300 to 400 Kg, superovulated by injection a total of 36 mg FSH. Superovulation was started at
any day of their cycle between day 9 to 14. The FSH was given twice daily in 12 hours intervals in decreasing doses for 3 and 4 days. Estmmate was injected on day 3 of superovulation (5 th FSH injection) and all donors were artificially inseminated with frozen semen on the onzet of oestrus, l2 hours and 24 hours afierwith. The embryo were non surgically collected on day seventh. Majority of embryo was in morulla stages (80.2 %) and 25.2 % was classified as untransferable embryos. Both the 3x2 and 4x2 regime were equally effective for the superovulation of dairy cattle. The means size of ovary (cur), total numbers of corpus luthcum (CL) and embryo (E) were 4.5 , 8.0 and 6.0 and 5.1, 8.6 and 6.6 for 3x2 and 4x2 regime respectively. Right ovary was more active than left ovary. The mean numbers of CL in the right ovary (4.8) was significantly higher (P<0.05) than those in the lelt ovary (3.6). No signifcantly difference on the mean size ovary and total number of embryos recovered (4.5 and 2.9 vs 5.3 and 3.4).


Keywords


Injection, Methodology, FSH, Embryos.

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