Comparative study of oestrus responses in unsynchronized jennies and jennies ® synchronized with single treatment of PGF2á (lutalyse ) in Zaria, Nigeria

Abstract

This study was carried out to compare oestrus responses in unsynchronized jennies and jennies synchronized using single treatment of PGF2& (Lutalyse®). Eight (8) cycling Jennies aged 3.0±2.0 years were used for this study. The jennies were randomly assigned to 2 groups of 4 jennies each; Group 1 (n=4): Jennies in this group were not treated with any agent; Group 2 (n=4): jennies treated with a single injection of 10mg of Lutalyse® . The synchronized and unsynchronized jennies were observed for behavioural oestrus three times daily (8-10 am, 12-2 pm and 4-8 pm) for two oestrous cycles. The fertility parameters determined in this study were: Oestrus response rate (ORR), Time to onset of oestrus (TOO), Duration of oestrus (DOO) and Intensity of synchronization (IS) within 48 hours. The ORR and IS were expressed in percentages while TOO and DOO were expressed as mean ± SEM. Comparisons between the groups were carried out using T- test. Onset of oestrus in group 1 (2.34±0.32 hours) was lower (P<0.01) than 10.07±4.91 hours in group 2. The duration of oestrus in group 1 (48±24.0 hours) was longer (P<0.05). than 24.0±0.0 hours in group 2. Oestrus response rate were 50 and 25% in both groups 1 and 2 while intensity of synchronization within 48 hours for groups 1 and 2 were both 50% (P>0.05). In conclusion, single treatment of PGF2á injection did not improve oestrus response rate and intensity of synchronization. However, more than a single treatment of PGF2& injection is recommended for effective oestrus synchronization in jennies.

Effects of repeated injections of cloprostenol sodium during the early luteal phase on luteolysis and hormonal changes in Large White X Pietrain sows in Otukpo, Nigeria

“…Because of the relative refractoriness of the porcine corpus luteum (CL) to the luteolytic effects of PGF2α during the first 12 days of the cycle. Thus, options for oestrus synchronization in pig production are still very limited, in comparison to options available in the husbandry of other domestic animals, like Jennies (Hassan et al, 2020) (De Rensis, and Peter, 1999), sheep (Menchaca et al, 2004),and goat (Omotese et al, 2016. The insensitivity of sow's CL to the luteolytic effect of PGF2α before day 12 is considered to preclude the use of prostaglandin in oestrus synchronization programmes for swine (Przygrodzka et al, 2015).…”