Effect of lactation number on milk yield in Holstein dairy cows
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Tarih
2021
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Objective: Aim of the present study was to determine the effect of the lactation number on milk productionand to detect the most economical lactation period in Holstein dairy cows.Materials and Methods: The animal materials of the study were 392 Holstein dairy cows with a similar dryperiod and lactation length. The cows were divided into 6 groups according to the number of lactations.The groups were formed as 1st lactation (Group 1; n=67), 2nd lactation (Group 2; n=124), 3rd lactation(Group 3; n=51), 4th lactation (Group 4; n=62), 5th lactation (Group 5; n=41) and 6th lactation (Group 6;n=47).Results: Average lactation milk yields for the 1st, 2nd, 3rd, 4th, 5th, and 6th lactations of the cows used inthe study were 7860.03 kg, 9010.02 kg, 10207.15 kg, 10165.89 kg, 8430.57 kg and 8069.78 kg, respectively. Itwas determined that the highest milk production and highest daily income were obtained during the 3rdand 4th lactation periods (p<0.05).Conclusion: In conclusion, milk production increased in the first three lactations, 3 and 4 lactation remainedstable and decreased in 5th and 6th lactations. But, regardless of the number of lactations during the first 6lactation periods, it is considered economical to use healthy cows for milk production in dairy farms
Açıklama
Anahtar Kelimeler
Kaynak
Turkish Journal of Veterinary Research (Online)
WoS Q Değeri
Scopus Q Değeri
Cilt
5
Sayı
1
