This study was carried out to determine the growth and reproductive performance of Karayaka sheep in Amasya province within the scope of National Animal Breeding Project. Data were collected from 17529 Karayaka lambs of 20120 Karayaka sheep which were born during 2012 to 2015 birth season. In this study, the live weights, survival rates of the lambs in various periods and reproductive traits of Karayaka ewes were investigated. In this study, the live weights, daily live weight gain, survival rates (90th day) and reproductive traits of Karayaka ewes were investigated. The averages of reproductive traits of Karayaka sheep such as infertility, fertility, twins, fecundity, litter size and survival rate were 13.8%, 86.2%, 7.20%, 0.867, 1.01 and 89.0% respectively. The effects of year, sex and type of birth on the birth weights and the live weights of 90 days (weaning) of Karayaka lambs were found to be significant. Daily live weight gain was affected only by year and sex.

The aim of study were to present relationships between birth weight of 94 Holstein calves with genotype structures of each sample’s Growth Hormone (GH) determined through PCR-RFLP method and to detect the population’s genetic variation by determining the genotype and allel frequency distribution. In the study, according to the analysis result, it was determined that Growth Hormone gene LL genotype was 41.9 kg, LL was 40.8 kg, and VV was 42.2 kg for the birth weight. A significant relationship between birth weight with GH genotypes could not be found. It was seen that the calf population is not stable according to Hardy-Weinberg genetic balance test.

In this study, it was aimed to determine the effect of oestru synchronization on the fertility of hair goats during the breeding season. Animal material of this experiment consisted of 200 heads of hair goats between 3 and 5 years of age. The animals were divided into two groups, (Control group, KG, n = 100; Oestrus synchronization group, KS, n = 100). The animals in the KS group received intravaginal sponges containing 30 mg flugestone acetate which removed after 12 days and 500 IU of PMSG/per animal administered IM. The animals in both groups were mated using bucks for 4 days. The single birth rate was 72% in the KG and 35% in the KS group. Fecundity and litter size were 1.20 and 1.59 in the control group and 1.25 and 1.64 in the KS group, respectively. As a result, the application of oestrus synchronization in hair goats during the breeding season improved the fertility.

In this study, growth performance of Akkaraman lambs and some fertility parameters of Akkaraman sheep raised in semi extensive farm conditions were investigated. A total of 6300 heads Akkaraman ewes (6000 ewes and 300 rams) housed in 34 farms located in central villages of Niğde province were evaluated between 2012 and 2016. The data of birth weight of 30161 lambs, body weight of 29517 lambs aged 90 days old and some fertility parameters of 30000 heads ewes were used. The average lambing rate of ewes was found 90.1%. The twining rate of ewes was 20.8%; the average litter size was 1.12 lambs. Birth weights of Akkaraman sheep lambs was 4.23 kg, average 90th day live weights were 23.05 kg. Effects of year, birth type, dam age, and sex were found statistically significant on birth and 90-day live weights of the Akkaraman lambs. As a result, it was concluded that the fertility of Akkaraman sheep and growth characteristics of lambs raised by public under semi-extensive conditions could be improved and the economic situation of sheep farms could be better by the implementation such improvement project.

Bu çalışma, Norduz kuzularının doğum ağırlığına cinsiyet, doğum tipi, ana yaşı, doğum yılı ve doğum ayının etkilerinin belirlenmesi amacıyla yapılmıştır. Ayrıca, kuzuların doğum ağırlığı ile ananın doğumdaki ağırlığı arasında bir ilişki olup olmadığı da değerlendirilmiştir. Çalışmada, Van Yüzüncü Yıl Üniversitesi Hayvancılık Uygulama ve Araştırma Merkezi Müdürlüğü bünyesinde 2021-2023 yılları arasında yetiştirilen toplam 196 Norduz kuzusunun doğum ağırlıkları ile analarının doğumdaki ağırlıklarına ait kayıtlar kullanılmıştır. Kuzuların ortalama doğum ağırlığı 4,28±0,85 kg olarak tespit edilmiştir. Kuzuların doğum ağırlığına doğum tipinin ve doğum yılının etkisi istatistiki olarak anlamlı bulunmuştur. Ancak, doğum ağırlığına cinsiyet, ana yaşı ve doğum ayının etkisinin olmadığı belirlenmiştir. Ayrıca, Norduz kuzularının doğum ağırlığı ile analarının doğumdaki ağırlığı arasında önemli düzeyde pozitif korelasyon tespit edilmiştir. Sonuç olarak, tek doğan kuzuların doğum ağırlığının ikiz doğanlara göre daha ağır olduğu ve 2021 yılında doğan kuzuların, 2022 ve 2023 yıllarında doğanlara göre daha yüksek doğum ağırlığına sahip olduğu belirlenmiştir.