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Öğe Determination of Appropriate Growth Models for Early Selection Possibilities in Goats(Zoological Soc Pakistan, 2017) Cak, Bahattin; Yilmaz, Orhan; Keskin, Siddik; Bayril, Tahir; Tariq, Mohammad MasoodGrowth models present a visual assessment of growth as a function of time and predict body weight at a specific age. We investigated the growth characteristics of Colored Mohair goat using four nonlinear growth models. Thirty (n=22 males and n=8 females) Colored Mohair kids were used. The kids were weighed at 2-week intervals from birth to 150 days. The Monomolecular, Gompertz, Richards and Three Parameter Logistic models were used. The best model was determined by considering the root mean square error, R-2% and asymptotic correlation coefficient criteria. We concluded that the Gompertz and Richards models were favourable for singletons and that the Richards model was favorable for determining twin Colored Mohair goat growth characteristics. Birth type should be considered in subsequent genetic evaluations. Furthermore, producing heavier carcasses (13-17 kg) in < 150 days may increase productivity and efficiency of the goat farming system.Öğe Dietary coenzyme Q10 may improve the growth performance and antioxidant status in quails exposed to cold stress(Polish Academy of Science, 2020) Bayril, Tahir; Akdemir, Fatih; Akşıt, Hasan Z.; Akşit, DilekIn this study, the effects of coenzyme Q10 (CoQ10) on growth performance, antioxidant status and organ weights in cold-stressed Japanese quails (Coturnix coturnix japonica) were investigated. During the experiment, a 2 × 3 factorial design was employed with two environmental temperatures (ET) and three levels of CoQ10 (0, 20 and 40 mg/kg). A total of 180 one-dayold male quails were randomly allocated into 6 groups with 6 replicates with 5 birds in each replicate. The birds were fed in two separate rooms at either 22 ± 2 °C for 24 h/day (thermoneutral, TN) or 12 ± 2 °C for 8 h/day (cold stress, CS; between 09:00 17:00) followed by 22 ± 2 °C for 16 h/day. CoQ10 addition into diet increased final body weight, body weight gain and cumulative feed intake only in CS regardless of the used dose. It was stated that CoQ10 supplementation did not exert influence on serum and liver superoxide dismutase (SOD) activity and liver total antioxidant status (TAS) in TN conditions, but increased these parameters in CS; however in liver the higher CoQ10 dose was required to obtain the statistically positive effect. When quails were exposed to CS a higher dose of CoQ10 caused a more pronounced decreased in serum malondialdehyde (MDA) level than the lower one; however the effect of CoQ10 on liver MDA level was shown regardless of the used dose. The obtained results show that CoQ10 supplementation reverses the negative effects of CS on growth performance, antioxidant status and organ weights in quails. The caused may effects partly associated with direct antioxidant properties of CoQ10 as well as the synergistic efficacy of CoQ10 with SOD activityÖğe The effect of dietary colostrum powder on performance, carcass yields and serum lipid peroxidation levels in Japanese quails (Coturnix coturnix Japonica)(Taylor and Francis Ltd., 2018) Akdemir, Fatih; Bayril, Tahir; Baran, Murat Sedat; Yıldız, Ahmet ŞenerColostrum is a nutrient-dense fluid secreted by female mammals for the first few days following birth. Colostrum can be supplemented to poultry diets as a feed additive due to its nutritious and performance-enhancing properties. This study was conducted to determine the effect of dietary colostrum powder (CL-P, Alpha Lipid Lifeline Colostrum, New Zealand) on growing performance, carcass weight and yield, organ weights, serum vitamins and malondialdehyde (MDA) levels in quails (Coturnix coturnix japonica). A total of 90 birds, one day old, were divided into 3 groups consisting of 6 replicate cages, 5 birds per cage. Birds were randomly fed on one of three diets: basal diet and basal diet supplemented with 2.5% or 5% of CL-P. At the end of the period of 42 days, CL-P supplementation increased final body weight (P <. 0001), weight gain (P <. 0001), feed intake (P =. 03), feed efficiency (P <. 0001), carcass weight (P <. 0001) and carcass yield (P <. 01). Amounts of serum MDA (P <. 001) levels also increased with increasing supplemental CL-P. As a result, growth performance can be improved and serum lipid peroxidation can effectively be attenuated by dietary CL-P supplementation at 5% of diets in Japanese quail.Öğe Effect of timing of artificial insemination after synchronization of ovulation on reproductive performance in Holstein dairy cows(Springer, 2013) Bayril, Tahir; Yilmaz, OrhanThe objective of this study was to determine the effect of timing of artificial insemination on pregnancy rates, calving rates, abortion rates, twinning rates, and calf gender ratio after synchronization of ovulation with Ovsynch protocol in Holstein dairy cows. The ovulation of 219 lactating Holstein dairy cows was synchronized using the Ovsynch protocol. Therefore, cows received an injection of GnRH followed by an injection of prostaglandin F-2 alpha 7 days later and a second treatment with GnRH 2 days later. Cows were artificially inseminated at 0, 12, or 24 h after the second injection of GnRH. Reproductive performance did not differ between cows inseminated at 0 h (n = 82), 12 h (n = 66), or 24 h (n = 71) after the last injection of GnRH (pregnancy rate: 0 h 48 %, 12 h 47 %, 24 h 52 %; abortion rate: 0 h 5 %, 12 h 0 %, 24 h 11 %; calving rate: 0 h 43 %, 12 h 47 %, 24 h 41 %; twinning rate: 0 h 2 %, 12 h 0 %, 24 h 0 %; calf gender ratio (F/M): 0 h 61:39 %, 12 h 48:52 %, 24 h 39:61 %; P > 0.05). Pregnancy rates for cows inseminated in postpartum times of 50-75, 76-100, and > 100 days within the first and a parts per thousand yen3 parities were statistically similar (P > 0.05), but pregnancy rates for cows inseminated at different postpartum times of 50-75, 76-100, and > 100 days within the second parity were different (P < 0.01). In general, pregnancy rates of cows inseminated at different postpartum times (P < 0.01) and parities (P < 0.001) differed. The findings of the current study showed that rates of pregnancy, abortion, calving, and twinning of Holstein dairy cows subjected to artificial insemination at different times after synchronization were similar. These results also indicate that the timing of artificial insemination after synchronization did not influence calf gender ratio. Furthermore, pregnancy rates of Holstein dairy cows inseminated after synchronization were significantly influenced by postpartum time and parity number.Öğe GROWTH PERFORMANCES OF FEMALE AND MALE HOLSTEIN CALVES FED WITH MILK AND MILK REPLACERS(Univ Agricultural Sciences & Veterinary Medicine Bucharest, 2016) Bayril, Tahir; Yilmaz, Orhan; Cak, BahattinThe objective of this study was to compare growth performances of male and female Holstein calves fed milk and milk replacers. A total of 60 Holstein calves were used in the study. Calves were divided into three equal groups. In each group, there were 10 female and 10 male calves. Calves were offered colostrum for 3 days after birth and were weighed at fourth day for the trial. Initial body weights of calves in dietary treatments were statistically similar. The first, second and third groups were fed milk, milk replacer-I (CP 21% and CF 16.5%) and milk replacer-II (CP 24% and CF 18%), respectively. In addition to milk and milk replacers, calves were supplemented with ad libitum concentrate feed and alfalfa. Dietary treatment was significantly effective (P< 0.05) on body weight of calves at 60 days of age. In conclusion, growth performances of calves increased with increasing protein content of milk replacer, also growth performances of calves fed milk and milk replacer containing high-protein had better than those of calves fed milk replacer containing low-protein. Therefore, during the suckling period, in feeding of Holstein calves, milk or milk replacer containing high-protein should be preferred primarily.
