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    Effect of castration at different ages on growth and carcass characteristics of Kilis goats: Physicochemical changes and fatty acid profile of meat
    (Consejo Superior de Investigaciones Científicas (CSIC), 2025) Gül, Sabri; Dursun, Ahmet; Türkmen, Dilek; Keskin, Mahmut; Güler, Zehra; Gündüz, Zuhal
    In this study, the effects of castration at different months of age on carcass and meat characteristics in goats reared under semi-extensive prolonged fattening conditions were investigated. Area of study: The experiment was conducted in the Yayladag & imath; district of Hatay province, Turkiye. Material and methods: The experiment was conducted with 48 male goats from the Kilis goat breed randomly allocated to 4 groups of 12 individuals each. Intact goats (uncastrated goats) functioned as the control group. Each of the other 3 groups was castrated using burdizzo forceps at the 4(th), 6(th), and 8(th) months after birth. During the experiment, all goats were exposed to the same management and feeding conditions. The effects of castration age on growth, carcass and slaughter parameters, as well as the muscle characteristics of the Longissimus thoracis, Semitendinosus, Psoas major, Triceps brachii, and Vastus lateralis were investigated. Main results: At the end of the fattening period, castration at 4-months age increased the weight of muscle tissue (P <0.05) and fat deposition (P <0.001). Additionally, an increase in intramuscular fat and tenderness of the meat, and a decrease in redness and cooking loss were observed with castration at 6-months age (P <0.05). Despite the increase in adiposity with early castration, the oleic acid and the ratio of unsaturated fatty acids to saturated fatty acids (UFA:SFA), hypocholesterolemic/hypercholesterolemic index (h/H) and Delta(9) desaturase index of the meat tended to increase as the castration age decreased. In conclusion, the most appropriate castration age is at 6-months in terms of growth performance and at 4-and/or 6-months in terms of meat quality. Research highlights: Castration of goats at the correct age plays a crucial role in managing herd dynamics, enhancing meat quality, improving efficiency, and meeting market demands in goat farming.
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    Öğe
    Effects of age, body region and mineral contents on the fleece characteristics of central anatolian merino sheep
    (Ege University, 2022) Behrem, Sedat; Keskin, Mahmut; Gül, Sabri; Ünay, Engin; Erişek, Abdulkadir
    The fibre characteristics of fleece determine its fate through the textile industry. Parameters such as diameter, length, elasticity and strength define the functional quality of fleece. Therefore, the aim of the present study was to investigate effects of different environmental factors as well as wool mineral contents on fleece fibre quality traits in Central Anatolian Merino sheep (CAM). Additionally, the mineral contents of CAM fleece were investigated. For this purpose, 300 samples were equally collected from 3 different body regions (shoulder, rib and rump) of 100 animals from five different age groups. Samples were analysed for fibre quality (diameter, length, elasticity and strength) traits and mineral contents (calcium, iron, potassium, magnesium, copper, manganese and zinc). A wide range of statistical relationships were found among the focused traits and those factors. The findings of this study highlight the importance of minerals as well as environmental factors on fleece qualityparameters.
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    Öğe
    Heritability and environmental influence on pre-weaning traits in Kilis goats
    (SpringerLink, 2023) Gül, Sabri; Arzık, Yunus; Kızılaslan, Mehmet; Behrem, Sedat; Keskin, Mahmut
    Birth and weaning weights, average daily weight gain, and Kleiber ratio are important indicator traits in selection decision. The phenotypic expression of these traits is determined by the genetic background, environmental effects, and their interactions. The objective of this study was to estimate genetic parameters regarding birth (BW) and weaning weights (WW) and average daily weight gain (ADWG), Kleiber ratio (KR), and obtain the effects of sex, birth type, herd, and year. The data consisted of 2274 Kilis goats with pedigree information obtained from 53 bucks and 774 does in 4 generations. The restricted maximum likelihood (REML) procedure was conducted with an animal linear mixed model. Sex, birth type, herd, and year were found to be statistically significant (p value < 0.001) for all traits. Moderate direct heritabilities (ha2) for BW, WW, ADW, and KR were found to be as 0.18 ± 0.03, 0.50 ± 0.04, 0.47 ± 0.04, and 0.37 ± 0.05, respectively. The proportion of maternal permanent environmental effect (c2) to the total phenotypic variance (?2p) was estimated as 0.00 ± 0.00, 0.12 ± 0.02, 0.11 ± 0.02, and 0.18 ± 0.03 for BW, WW, ADWG, and KR, respectively. The genetic, phenotypic, and environmental correlations between the pre-weaning growth traits were found to be ranging from ? 0.02 to 0.99. Thus, our study suggests moderate heritabilities and positive and relatively high genetic correlations among the observed pre-weaning growth traits. These results have implications in terms of providing rapid genetic progress for these traits in breeding programs of Kilis goats.