Determination of Adjustment Factors of Milk Yield According to Mature Age in Brown Swiss Breed Cattle

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Publiée : Ιουλ 5, 2025
DOI : https://doi.org/10.12681/jhvms.38990
A Kaygisiz
Department of Animal Science, Faculty of Agriculture, Kahramanmaraş Sütcü Imam University, Kahramanmaraş, Türkiye
O Şahin
Department of Animal Production and Technologies, Faculty of Applied Sciences, Muş Alparslan University, Muş, Türkiye
https://orcid.org/0000-0002-3801-3881
İ Yilmaz
Department of Animal Production and Technologies, Faculty of Applied Sciences, Muş Alparslan University, Muş, Türkiye
https://orcid.org/0000-0001-6796-577X
Résumé

The aim of this study was to determine adjustment factors for 305-day milk yield according to mature age in Brown Swiss cattle raised in Türkiye. A total of 19,042 milk yield records from 10,127 cows across 44 provinces were analyzed. Age correction factors were calculated using three methods: (i) Simple Averages Methods, (ii) Polynomial Regression Methods, and (iii) Gross Comparison Methods. The cows were divided into four calving seasons: spring, summer, fall, and winter. Results showed that cows calving in winter reached maturity at 37-39 months, earlier than those calving in other seasons. Adjustment factors for the youngest cows (≤ 24 months) and the oldest cows (≥ 109 months) were also determined to account for variations in milk yield. The study confirmed that winter-calving cows exhibit higher early lactation milk yields, likely due to favorable environmental conditions. These newly developed adjustment n factors provide a more precise estimation of genetic trends, aiding in more effective breeding strategies. Future studies with larger datasets are recommended to enhance accuracy further.

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