Barry, Daniel M.Francis, J.Nethengwe, Luvhengo Dakalo2016-02-122016-02-122016-02-12Nethengwe, L.D. 2016. Effects of ovulation-inducing drugs on pregnancy rates of cattle in rural areas after synchronized oestrus and artificial insemination. . . http://hdl.handle.net/11602/410http://hdl.handle.net/11602/410MRDVInstitute of Rural DevelopmentThe effect of hormones that play a role during ovulation in the cow, like oxytocin, prostaglandin F20 (dinoprost PGF20) and human chorionic gonadotropin (hCG) were used to increase the ovulation rate, therefore pregnancy rates, when injected intramuscularly at the time-of artificial insemination (Al). Frozen-thawed Bonsmara and Nguni semen was used in synchronized cows of different ages, breeds and body condition scores (BCS). The main objective of this study was to evaluate the effect of oxytocin, PGF2a and hCG on the animal's fertility measured as conception rates (CR) and to improve cattle genetics in the rural communities of Vhembe district by the use of Al. A total of 205 beef cattle (142 cows and 63 heifers) were used in this study. Cows and heifers were synchronized in groups by inserting CIDRs in the vagina with 2 mg of oestradiol benzoate (Cidirol) intramuscular injection on day O of synchronization. On day 6 in the afternoon, females were injected with 25 mg prostaglandin F20 (dinoprost Lutalyze). On day 7 in the morning the CIDRs were pulled out of the vagina and in the afternoon the females were injected with 2 mg of oestradiol benzoate (Cidirol). During day 8 to 9 signs of possible oestrus were visually observed by cattle owners three times a day for a minimum of 30 minutes a time. From day 9 to 10, Al was performed following the AM/PM rule by the same technician using good quality frozen-thawed semen 12 hours after the beginning of standing oestrus. Cows and heifers were alternately assigned to one of the three ovulation inducing drugs: 300 IU hCG (Chorulon), n = 52; 25 mg PGF2a hormone (dinoprost Lutalyze), n = 49; 50 IU oxytocin hormone (Fentocine), n = 46; or 5 ml sterile isotonic (saline) as a control, n = 58. The pregnancy results between the three ovulation inducing drugs and sterile isotonic saline were statistically analyzed using Genera! Linear Model (GLM) procedures of minitab (minitab 2013) using 2 x 4 factorial in a completely randomized design. The treatment means were compared using Tukey's post hoc test. Significant was set at p<0.05. On average the control treatment had the highest pregnancy rate followed by hCG, PGF2a and oxytocin respectively, across all the age groups data, although this was not significantly different (p>0.05). Pregnancy rate was lowest in the animals that received oxytocin and was significantly different from the other three treatment (p<0.05). Other factors such as semen breed and body condition score did not significantly affected the pregnancy rates (p>0.05). Thus, there was no improvement in pregnancy rates among communal beef cattle by administering hCG, oxytocin and PGF20 at the time of artificial insemination in the present study.1 online resource (ix, 61 leaves): illustrationsenUniversity of VendaOestrus synchronizationUCTDAlhCGPGFOxytocinBCS and pregnancy rate636.20245Cattle breedsCattle-pregnancyCattle -- ReproductionCattle -- breedingLivestock breedsCattle - FertilityDissertationNethengwe LD. Effects of ovulation-inducing drugs on pregnancy rates of cattle in rural areas after synchronized oestrus and artificial insemination. []. , 2016 [cited yyyy month dd]. Available from: http://hdl.handle.net/11602/410Nethengwe, L. D. (2016). <i>Effects of ovulation-inducing drugs on pregnancy rates of cattle in rural areas after synchronized oestrus and artificial insemination</i>. (). . Retrieved from http://hdl.handle.net/11602/410Nethengwe, Luvhengo Dakalo. <i>"Effects of ovulation-inducing drugs on pregnancy rates of cattle in rural areas after synchronized oestrus and artificial insemination."</i> ., , 2016. http://hdl.handle.net/11602/410TY - Dissertation AU - Nethengwe, Luvhengo Dakalo DA - 2016-02-12 DB - ResearchSpace DP - Univen KW - Oestrus synchronization KW - Al KW - hCG KW - PGF KW - Oxytocin KW - BCS and pregnancy rate LK - https://univendspace.univen.ac.za PY - 2016 T1 - Effects of ovulation-inducing drugs on pregnancy rates of cattle in rural areas after synchronized oestrus and artificial insemination TI - Effects of ovulation-inducing drugs on pregnancy rates of cattle in rural areas after synchronized oestrus and artificial insemination UR - http://hdl.handle.net/11602/410 ER -