The survival analysis of some environmental factors associated with lamb mortality in Awassi sheep

Ceyhan, Ayhan; Kozaklı, Özge

doi:10.1007/s11250-023-03821-y

Cited by 3 publications

(1 citation statement)

References 26 publications

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“…Lamb deaths are one of the crucial problems in sheep farming. Sustainable production in sheep breeding largely depends on the successful breeding of sheep and the survival of the offspring until weaning age (Ceyhan & Kozaklı, 2023). In the study, the L60 value of Akkaraman lambs was higher in males than in females, while the L120 value in females was higher than in males.…”

Section: Survival Rate Of Lambsmentioning

confidence: 69%

Investigation of Some Fertility and Growth Traits of Akkaraman Sheep under Breeder Condition in Altunhisar District of Niğde Province

Duman,

Şekeroğlu,

Aksoy

2024

Turkish JAF Sci.Tech.

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The aim of this study was to determine some reproductive and growth characteristics and was to analyses some environmental factors the growth and survival performance of lambs between 2017 and 2020 reared within the framework of the National Small Ruminant Project in Altunhisar district of Nigde. The data of the study were collected from 24000 heads ewes and 24869 male and female lambs raised in 25 different farms. The average of infertility, fertility, fecundity, litter size, single and twining rates of Akkaraman ewes were found to be 7.90, 92.10, 1.04, 1.13, 87.49 and 12.51%, respectively. The effects of year of birth, type of birth, age of dam and gender on birth, 60th day and 120th day live weights of Akkaraman lambs were found to be statistically significant (P<0.001). It was also determined that the effect of type of lambing, gender, year of birth and dams age on the survival of lambs at 60th and 120th days was significant (P<0.01). The average survival rate of lambs at 60th and 120th day was 96.2 and 95.3.%, respectively. As a result, it was concluded that while the reproductive characteristics of Akkaraman ewes were in accordance with the literature reports, the effects of the environmental factors on the live weights and survival of lambs were significant and these factors were partially affected by slower growth.

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Section: Survival Rate Of Lambsmentioning

confidence: 69%

Investigation of Some Fertility and Growth Traits of Akkaraman Sheep under Breeder Condition in Altunhisar District of Niğde Province

Duman,

Şekeroğlu,

Aksoy

2024

Turkish JAF Sci.Tech.

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Effects of β-carotene supplementation and age on the oxidative status, production and reproductive performance of grazing ewes

Ahmed,

Hassen,

Lehloenya

2024

Anim. Prod. Sci.

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Context There is some evidence that physiological stages such as breeding, pregnancy, parturition and lactation may trigger oxidative stress. It has also been observed in several species, including sheep, that age affects their vulnerability to oxidative stress. Aims This study investigated the effects of supplemental β-carotene and age on the oxidative status of grazing ewes around breeding, pregnancy, parturition and early lactation as well as on their production and reproduction performance. Methods Hundred and four ewes were divided into two broad age groups (young = 1–3 years, and old = 4–6 years). Within age groups, ewes of similar age were randomly assigned to four treatment groups (A1, A2, A3, C) by using a completely randomised block design. The young (n = 13) and old (n = 13) sheep in Groups A1, A2 and A3 were daily drenched with 100 mg, 75 mg and 50 mg β-carotene respectively. Group C was unsupplemented (Control). Supplementation lasted 28 days before oestrus synchronisation; 14 days during oestrus synchronisation (CIDR) and hand-mating; 18 days post-hand-mating; 30 days before lambing; and 15 days after lambing. All animals were grazed on Kikuyu grass (Pennisetum clandestinum). Six ewes from each group (total = 24) were sampled for blood to measure oxidative and hormonal status during the experiment. Key results Supplemental β-carotene at ≥75 mg/day may act as a pro-oxidant in ruminants under oxidatively stressed conditions such as parturition. Age did not affect the ewes’ oxidative status. The supplemental β-carotene did not affect bodyweight, oestrus parameters, corpus luteum size, conception rate and litter size. Except for a tendency of lambs from supplemented ewes to have heavier weight at 15 days old (P = 0.080), age group and supplemental β-carotene did not affect the lamb mortality rate or weight at birth or 15 days old. Older ewes showed earlier and longer duration of oestrus than did younger ewes. Conclusions Supplementation of grazing ewes with β-carotene should not be ≥75 mg/day, especially at parturition period, because it may work as a pro-oxidant. The older ewes seem to have earlier oestrus with a longer duration than do the younger ones. Implications Caution is urged when administering high doses of β-carotene to ewes during the peri-parturient period.

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Epidemiological study of lamb and kid morbidity and mortality rates and associated risk factors in an extensive management system in the Dalocha district, Silte Zone, Central Ethiopia

Anwar,

Abebe,

Sheferaw

2024

Animal Diseases

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Small ruminants are vital to the economy of Ethiopia and significantly contribute to the livelihoods of resource-poor farmers. However, poor management practices and high mortality rates among young lambs and kids have hindered their economic potential. A prospective cohort study was conducted in three rural villages in Dalocha district with the aim of estimating morbidity and mortality rates among these animals and identifying associated risk factors. The study monitored 130 lambs and kids every 15 days from birth to three months and recorded health events and deaths. Data analysis utilized Kaplan‒Meier survival analysis, log-rank tests, and multivariate Cox proportional hazard regression. The results revealed an overall morbidity rate of 0.58 and a mortality rate of 0.2 cases per 100 lamb days at risk for lambs, whereas the rates of morbidity and mortality for kids were 0.27 and 0.1 cases per 100 kid days, respectively. Respiratory issues were the leading health problem, accounting for 35.9% of morbidity cases, whereas diarrhea accounted for 38.5% of deaths. The hazard of morbidity was 2.1 times greater for lambs than for kids (HR = 2.1; p = 0.039). Additionally, the morbidity hazard was significantly greater in lambs and kids from multiparous dams (HR = 3.8, p = 0.017) but 89% lower in vaccinated flocks (HR = 0.11, p = 0.001). The identified risk factors for mortality included litter size and maternal behavior. Twin-born lambs and kids presented a mortality hazard that was 6.31 times greater than that of singletons (HR = 6.31; p = 0.025), whereas offspring from dams with poor mothering presented a mortality hazard that was more than 24 times greater (HR = 24.56; p = 0.006) than that of offspring from normal mothers. This study underscores the need for improved maternal care, access to colostrum, better bonding, and suitable environments for multiple births to reduce morbidity and mortality rates among lambs and kids. Further research into the specific causes of these issues is recommended.

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The survival analysis of some environmental factors associated with lamb mortality in Awassi sheep

Cited by 3 publications

References 26 publications

Investigation of Some Fertility and Growth Traits of Akkaraman Sheep under Breeder Condition in Altunhisar District of Niğde Province

Investigation of Some Fertility and Growth Traits of Akkaraman Sheep under Breeder Condition in Altunhisar District of Niğde Province

Effects of β-carotene supplementation and age on the oxidative status, production and reproductive performance of grazing ewes

Epidemiological study of lamb and kid morbidity and mortality rates and associated risk factors in an extensive management system in the Dalocha district, Silte Zone, Central Ethiopia

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