The Journal "Agriculture and Forestry"
Časopis "Poljoprivreda i šumarstvo"
- Since 1955 -
Year 2024, Volume 70 Issue 3 (30.09.2024)
| Year : | 2024 |
| Volume : | 70 |
| Issue : | 3 (30.09.2024) |
| Authors : | Radena NENOVA, Yordanka ILIEVA, Ivan FASULKOV, Manol KARADAEV, Nasko VASILEV, Pencho PENCHEV |
| Title : | EFFECT OF DIFFERENT HORMONAL PROTOCOLS ON CLINICAL SIGNS OF ESTRUS AND CONCEPTION RATES IN BUFFALOES |
| Abstract : | The protocols PreSynch/OvSynch, OvSynch and OvSynch+PRID were applied in breeding season (IBS) and out of it (OBS) in 133 buffalo cows and OBS in 75 heifers. Gestation was diagnosed sonographically 45 days after timed artificial insemination (TAI). Dispersion analysis was conducted, including the factors: protocol; clinical signs of estrus (without CSE; patency of cervix; mucous discharge); age. Another 3-factor analysis solely on buffalo cows included the effect of season. The results show that the factor protocol has the most pronounced effect on TAI success (P≤ 0.01), significantly lowest being the pregnancy rate (pi values) under PreSynch/OvSynch protocol – only 23.9%, compared to 40.7 and 47.4% under OvSynch and OvSynch+PRID, respectively. Although the effect of age is non-significant, in the heifers OvSynch+PRID and OvSynch show markedly higher results (50.0 and 52.9% respectively), while in the buffalo cows the differences are smaller, the OvSynch protocol having a relatively low pregnancy rate (38.3%), OvSynch+PRID – highest (45.0%), and PreSynch/OvSynch – lowest (30.4%). Season has non-significant effect, but the conception rate from OvSynch+PRID applied OBS is higher than IBS, so it can be used for overcoming the problematic seasonal anestrus. CSE is a significant source of variance of conception rates (P≤ 0.05), predictably the highest pi value belonging to the cases with mucus. The superiority of the OvSynch+PRID protocol finds expression in the highest incidence of full estrus (with mucus) in the lactating buffaloes (70%) and even more in the heifers (82%), as compared to PreSynch/OvSynch (56.5 and 52.2% respectively) and OvSynch (51.1 and 50.0%). |
| For citation : | Nenova, R., Ilieva, Y., Fasulkov, I., Karadaev, M., Vasilev, N., Penchev, P. (2024): Effect of different hormonal protocols on clinical signs of estrus and conception rates in buffaloes. Agriculture and Forestry, 70 (3): 59-70. https://doi.org/10.17707/AgricultForest.70.3.04 |
| Keywords : | buffaloes, conception rate, estrus signs, PRID, prostaglandin, gonadotropin |
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