Altınova Tarım İşletmesinde Yetiştirilen Esmer Sığırların Süt ve Döl Verim Özellikleri

Abstract

Öz : Bu araştırma, Altınova Tarım İşletmesinde yetiştirilen Esmer sığırların süt ve döl verim özelliklerini belirlemek amacıyla yapılmıştır. Araştırmanın materyalini, 1984Araştırmanın materyalini, -1997 Milk Yield and Reproductive Traits in Brown Swiss Cattle Raised at Altınova State FarmAbstract : The purpose of this study was to investigate the milk yield and reproductive traits of Brown Swiss cattle raised at Altınova State Farm. Milk yield and reproductive traits data used in this study had been collected within a period of 14 years from 1984 through 1997. A total of 1058 lactation records from 324 cows were analysed within the research period. The least squares means for 305 daily milk yield, lactation period and dry period were found as 5340±91 kg, 302±4 days and 82.1±3.2 days, respectively. From the factors which their effects were investigated, effect of years on the 305 days milk yield were found to be highly significant (P<0.01), on the lactation period found to be significant (P<0.05), on the dry period found to be insignificant. The effect of parity on the 305 days milk yield and lactation length were found to be highly significant (P<0.01). The least squares means for age of the heifers at first breeding, age at first calving, calving interval and service period were 614.9±8.8 days, 904.8±39.4 days, 383.1±4.7 and 99.5±5.0 days respectively. The effect of calving years on age of the heifers at first breeding had highly significant (P<0.01).

Creating a Lactation Model for 305-Day Milk Yield with Different Resampling Techniques (Bagging Mars) in Mars Modeling

“…In the current study, the average milk yield according to the lactation order in Table 2 varies between 24.43 and 34.96 (Omar, 2022). In the study of Omar (2022) (Asan, 2021;Çetin and Alkoyak, 2018;Genç and Soysal, 2018;Keskin and Boztepe, 2011;Şahin and Ulutaş, 2010;Sarar and Tapkı, 2017;Tırınk, 2021;Yaylak and Kumlu, 2005)was reported to vary between 5395.11-8264.70 kg and these values are among the values of the current study.…”

“…This period may vary depending on care and feeding (Özyurt and Özkan, 2009).It is imperative to take into account their reproductive performance, which affects the productivity of dairy cows and has a major impact on the profitability of dairy production establishments. To this end; In many studies, calving interval, pregnancy rate, insemination number for pregnancy, service period, first insemination and first calving age have been used to evaluate reproductive performance (Bayril and Yilmaz, 2017;Boğa and Boğa, 2022;Çanga and Boğa, 2022;Doğan, 2003;Mee, 2004;Şahin and Ulutaş, 2010). Lactation curves can be used to calculate lactation continuity, which indicates the animals' ability to maintain a constant milk yield.…”

“…Various methods have been proposed for calculating lactation persistence, but there is still no standard method. In studies conducted in different years on the average milk yield of 305 days in Holstein cows in Türkiye, varying results have been reported over the years (Gürses and Bayraktar, 2012;Omar, 2022;Orhan, Çetin Teke, and Karcı, 2018;Şahin and Ulutaş, 2010;Sarar and Tapkı, 2017;Yaylak and Kumlu, 2005). However, many researches made have been done on milk production modeling and various models have been developed to explain the relationship between control day and milk production (Bayril and Yilmaz, 2017;Eyduran, Yilmaz, Tariq, and Kaygisiz, 2013;Orhan et al, 2018).…”

“…Resampling clustering can be used as a tool to reduce the variance of a predictor and increase the stability and power of predictions (Çanga and Boğa, 2020;Celik and Yilmaz, 2021;Otok, Putra, Sutikno, and Yasmirullah, 2020;Şengül et al, 2022). When the literature is reviewed, many researches have been done on milk production modeling and various models have been developed to explain the relationship between control day and milk production (Alıç, 2007;Bilgiç, 1999;Çetin and Alkoyak, 2018;Doğan, 2003;Orhan and Kaygısız, 2002;Şahin and Ulutaş, 2010).…”