PROSTAGLANDIN VERSUS PROGESTAGEN PROTOCOLS IN OESTRUS SYNCHRONIZATION IN THE YANKASA EWE
PROSTAGLANDIN VERSUS PROGESTAGEN PROTOCOLS IN OESTRUS SYNCHRONIZATION IN THE YANKASA EWE
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Date
2015-04
Authors
DANJUMA, FRIDAY AUDU
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Abstract
This study was carried out to compare the effects of prostaglandins (Lutalyse® and estroPLAN®) and progestagen (CIDR® and FGA-45®) in the synchronization of oestrus in Yankasa ewes. Cycling Yankasa ewes (n = 26), aged 1 to 4 years and weighing 14-28 kg with body condition scores of 2.5-3.5 were used in this study. They were randomly allocated into four groups: Group I ([YK-LT], n = 7) ewes were treated with Lutalyse®, Group II ([YK-ET], n = 7) with estroPLAN®, Group III ([YK-CD], n = 5) with CIDR® and Group IV ([YK-FG], n = 7) with Fluorogestone acetate-45®. The prostaglandin treatments were 2 intramuscular injections given 12 days apart while the progestagens were a-12-day intravaginal implants. Natural breeding was carried out using matured, sexually active proven rams for 5 days following the second prostaglandin injection in groups I and II and progestagen withdrawal in groups III and IV. Breeding was used to evaluate the effect of treatment in each group of ewes on parameters of oestrus (oestrus response rate, time-to-onset of oestrus, duration of oestrus, mean-mount per oestrus-detection-time and tightness of oestrus synchrony), conception rate (non-return to oetrus), pregnancy rate or progesterone profile. The results showed that oestrus response was 85.7 %, 100 %, 100%, 100 %, in the YK-LT, YK-ET, YK-CD and YK-FG groups, respectively. Time to onset of oestrus was 68.23 ± 17.28 h, 49.29 ± 4.48 h, 33.48 ± 8.58 h and 53.27 ± 12.33 h in the YK-LT, YK-ET, YK-CD and YK-FG, respectively. Duration of oestrus was 51.35 ± 13.9 h, 31.19 ± 7.9 h, 34.85 ± 8.3 h and 24.90 ± 6.3 h in the YK-LT, YK-ET, YK-CD and YK-FG groups, respectively. Mounts per oestrus period were 24.6 ± 5.9, 14.3 ± 4.3, 23.2 ± 6.8 and 14.7 ± 4.6 in the YK-LT, YK-ET, YK-CD and YK-FG groups, respectively. Conception rate equaled pregnancy rate and was 100 %, 100 %, 100 % and 86% in the YK-LT, YK-ET, YK-CD and YK-FG groups, respectively. The average serum progesterone (P4) concentrations 21 days post breeding were, 1.5 ± 0.54 ng/ml vs 2.7 ±0.35 ng/ml, 1.1 ± 0.28 ng/ml vs 3.1 ± 0.81
ng/ml, 1.1 ± 0.47 ng/ml vs 3.2 ± 0.44 ng/ml and 0.87 ± 0.38 ng/ml vs 2.3 ± 0.98 ng/ml in the YK-LT, YK-ET, YK-CD and YK-FG groups, respectively. Both protocols were efficient in oestrus synchronization. However, estroPLAN® and CIDR® offered the best results in synchronizing oestrus in Yankasa ewes and may be used by farmers to enhance productivity.
Description
A THESIS SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES, AHMADU BELLO UNIVERSITY, ZARIA, IN PARTIAL FULFILLMENT OF THE REQUIREMENT FOR THE AWARD OF THE DEGREE OF MASTER OF SCIENCE IN THERIOGENOLOGY DEPARTMENT OF THERIOGENOLOGY AND PRODUCTION FACULTY OF VETERINARY MEDICINE AHMADU BELLO UNIVERSITY, ZARIA, NIGERIA
Keywords
PROSTAGLANDIN VERSUS PROGESTAGEN PROTOCOLS,, OESTRUS SYNCHRONIZATION,, YANKASA EWE,