pISSN:1309 - 6958       eISSN:2146 - 1953
2005, Cilt 21, Sayı 3-4, Sayfa(lar) 015-022
Investigation of Effect on Fertility of Different Oestrus Synchronization Methods in Cows in Field Conditions
Bülent Bülbül1, Mehmet Bozkurt Ataman2
1Bahri Dağdaş Uluslararası Tarımsal Araştırma Enstitüsü Müdürlüğü, KONYA
2Selçuk Üniversitesi Veteriner Fakültesi, Reprodüksiyon ve Suni Tohumlama Anabilim Dalı, KONYA
Keywords: Oestrus, synchronization, fertility, cow
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In this study, the effect of PGF:o + PGF^, GnRH + PGF,U, PRID + PGF3(! and ear implant + PGF:„ applications on estrus synchronization and fertility in cows in lield conditions were investigaled. A totaî ol 125 Holsteın cows were used as material. Cows were randomly divided in to five groups. Two injections of PGF:„ was applied 11 days apart in the first group (n=25). GnRH (day 0) and PGF:„ (7 day later) was injected in the second group (n=25). PRID's were inserted to the anterior vagina of each cow lor 12 days and PGFi„ was injected before the day of PRID removal in the third group (n=25). Ear implants were inserted to the ear of each cow subcutaneousty tor 9 days and PGF;„ was injected before the day of implant removal in the fourth group (n=25). Cows in the group V (n=25) were served as control. Artificial inseminations were performed twice at 72-96 hours m the group i and 48-72 hours in the groups II. til and IV after the last application. Cows in the control group (n=25) were inseminated with regard o the spontaneous estrous Pregnani cows were determined by rectal palpation between 60-90 days after the second inse ination. Estrous and pregnancy rates were °e100.0'o96 00, %100, %100 and %100; %84 00. %62.50, %84.00, %72.00 an ı %52.00. respectively, in the groups I, II, 111. IV and V identical estrous rates were found in all groups (P>0 05) Pregnancy rates in the groups I and III were higher than group V (P<0.05). However pregnancy rates were similar in the groups I. II. Ill and IV (P>0.05), In conclusion, it was determined that two injections of PGF2q. GnRH + PGF:a and implant +■ PGF?U methods are more economic than PRID + PGF,„ method Looking the more advantegeous about application easiness and agreement of fanner, the injections pf PGF V, 11 days apart and GnRH + PGF2u is more advantageous. However, it was concluded that, all of the synchronization methods used in our study were determined as useful because of allowing fixed-time insemination without estrous detection. synchronising estrous and increasing of pregnancy rates in field conditions.