The effect of breed type and lactation status on reproductive performance in

Kridli, Rami T.; Abdullah, A. Y.; Husein, Mustafa Q.

doi:10.4314/sajas.v39i1.61210

Cited by 5 publications

(4 citation statements)

References 12 publications

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“…This study could not find any significant differences for the onset of oestrus. These results were however, different to that observed by Kridli et al (2009), in brown and black faced Awassi ewes. Nonetheless, it appears that the onset of oestrus following oestrus synchronization occasionally depends on the protocol used (Uriol et al, 2019).…”

Section: Discussioncontrasting

confidence: 99%

“…There was a breed variation for conception rate, with Zulu and Bapedi performing better than that of Namaqua Afrikaner and Damara. Results found between Bapedi sheep and Zulu sheep were similar to that reported previously by Kridli et al (2009); Zeleke et al (2005) and Mansur et al (2018) where lambing rate could not differ among breeds and their lactation statuses. The conception and lambing rate of Zulu sheep and Bapedi sheep were comparable to Farrag (2019) results who reported that, oestrus synchronization result in higher conception rate on the Abou-Delik sheep.…”

Section: Discussionsupporting

confidence: 90%

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A Comparative Study on the Reproductive Performance of South African Indigenous Sheep Breeds Following Oestrus Synchronization

Ngcobo¹,

Nedambale²,

Chokoe³

et al. 2022

American Journal of Animal and Veterinary Sciences

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The aim of the study was to compare the effect of age and live body weight on the oestrus response, duration, pregnancy rate and lambing rate among South African indigenous sheep breeds (Zulu sheep = 36, Bapedi sheep = 26, Damara sheep = 10 and Namaqua Afrikaner sheep = 9). Control Intravaginal Drug Release Dispensers (CIDR's) were inserted into the vagina for 10 days. The twitching of tail and standing to be mounted in the presence of the teaser ram were most targeted signs of oestrus. Data were subjected to an appropriate analysis of variance (ANOVA). The scores were subjected to 1:1 Frequency table and a Chi-Square (²) test for the equal proportions test. One Bapedi ewe loss CIDR before removal date hence was removed from the experimental animals. All Namaqua Afrikaner (100%) ewes responded to the synchronization protocol with the longest oestrus duration (70.7±7.2 h). However, Namaqua Afrikaner sheep scored the lowest rate for conception (44%) and lambing (44%). No significant different (P>0.05) observed for the onset of oestrus among the breeds. Four years old ewes responded better to oestrus synchronization than ≤3, 5 and ≥6 years. Nevertheless, ewes that were ≥6 years old had higher conception rate (94%) and lambing rate (84%). Zulu sheep had higher (89%) lambing rate than Damara (60%) sheep and Namaqua Afrikaner (44%) sheep. Lighter ewes had higher conception (83%) and lambing rate (90%) than heavier (77 and 64%) and moderate (68 and 78%) weights, respectively. In conclusion, Zulu sheep were more fertile than other South African indigenous breeds following oestrus synchronization. On the other hand, young ewes (≤3 years) produced heavier lambs and weaning weight but had higher mortality rate due to inexperience.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionsupporting

confidence: 90%

A Comparative Study on the Reproductive Performance of South African Indigenous Sheep Breeds Following Oestrus Synchronization

Ngcobo¹,

Nedambale²,

Chokoe³

et al. 2022

American Journal of Animal and Veterinary Sciences

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“…It has been reported that increasing prolactin concentration due to stimulations during the lactation period has a suppressive effect on gonadotropins and therefore breeding activity is inhibited by the negative effect of pulsatile LH release and the first LH peak in suckling or lactating ewes (21). Another study (22) revealed that lactating ewes that were not suckling their lambs and were at least 90 days in milk had high lambing rates (85.5%). It is suggested that the lower lambing rates obtained in this study may be due to the lactation status or the continuation of suckling.…”

Section: Discussionmentioning

confidence: 99%

Effect of fluorogestone acetate and eCG on reproductiveparameters in lactating Pırlak ewes

Algan¹,

Uçar²,

Yilmaz³

2017

Turk J Vet Anim Sci

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“…The application of estrus synchronization programs has been well-documented since the 1970s. In small ruminants, estrus synchronization is achieved either by reducing the length of the luteal phase of the estrous cycle with PGF 2α or by extending the cycle artificially with exogenous progesterone or more potent progestagens (Kusina et al, 2000 andKridli et al, 2009). Particularly that the ability to synchronize the time of breeding and lambing and the achievement of high fertility at first service is highly beneficial for farmers (Gonzalez-Bulnes et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

SOME IMPORTANT ASPECTS IN UTILIZATION OF PGF2α ON ESTRUS SYNCHRONIZATION OF OSSIMI EWES

2011

Egyptian Journal of Animal Production

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One hundred and one Ossimi ewes were used to study the effect of order of mating after PGF 2α estrus synchronization on conception rate (CR). Ewes were weighed and scored for body condition and rams were tested for their semen by semen analysis immediately before onset of mating. Ewes were estrus-synchronized with intramascular dose of 0.5 ml PGF 2α , and after 11 days of the first injection ewes that did not show estrus were injected with another 0.5 ml dose. Simultaneously, with the first and the second injections of Estrumate, ewes which came in heat were introduced to fertile rams to be hand-mated. ANOVA were performed to study the effect of CR of ewes at the first and the second estrus matings, and also to study the effect of age, body weights (BWT) and body condition scores (BCS) of ewes on CR at the first and the second estrus matings. Correlation coefficients between CR of ewes and their ages, BWT and BCS were performed.About 77% of mated Ossimi ewes in the second estrus mating were fertilized compared to only 18% in the first one (P<0.001). At the first estrus mating, the significance level (P<0.05) was attained for the correlation of CR with BCS of ewes, while it was not attained for both age of ewes or their body weights. Body condition scores of ewes significantly affected CR at first estrus mating (P=0.017). Therefore, it is recommended to breed ewes at the second heat after estrus synchronization with PGF 2α to save the power of rams and preserve their capabilities for increasing CR through the second estrus after synchronization.

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The effect of breed type and lactation status on reproductive performance in

Cited by 5 publications

References 12 publications

A Comparative Study on the Reproductive Performance of South African Indigenous Sheep Breeds Following Oestrus Synchronization

A Comparative Study on the Reproductive Performance of South African Indigenous Sheep Breeds Following Oestrus Synchronization

Effect of fluorogestone acetate and eCG on reproductiveparameters in lactating Pırlak ewes

SOME IMPORTANT ASPECTS IN UTILIZATION OF PGF2α ON ESTRUS SYNCHRONIZATION OF OSSIMI EWES

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