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Dergiler / Turkish Journal of Veterinary and Animal Sciences / 2011 / Cilt: 35 - Sayı: 2

Statistical evaluation of some environmental factors aff ecting the gross effi ciency of crude protein in high producing dairy cows

Pouya ZAMANI
Ahmad AHMADI
Seyed Reza MIRAEI-ASHTIANI
Hasan ALIARABI
Ali Asghar SAKI
Khalil ZABOLI
Daryoush ALIPOUR
Sayfa
123–130
Yayın Tarihi
2022-11-05
DOI
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⚡ TL;DR(1 Cümlede Hızlı Çıkarım)

In comparison to NRC estimations, it seems that more NEL, less CP, and more RUP are needed to maximize the protein effi ciency of lactating dairy cows.

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Amaç & Hipotez:Some environmental factors affecting the gross effi ciency of crude protein (GECP) were studied using 2824 records of 501 lactating Holstein cows.
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Temel Bulgular & Veri:Th e GECP was signifi cantly aff ected by parity and pregnancy stage and linearly related to dry matter intake, milk yield, milk fat, protein and lactose percentages, protein and lactose yields, dietary levels of net energy for lactation (NEL), crude protein (CP), ruminally undegradable protein (RUP), and ether extract (EE).
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Sonuç & Katkı:In comparison to NRC estimations, it seems that more NEL, less CP, and more RUP are needed to maximize the protein effi ciency of lactating dairy cows.
🔬Tür:Modelleme & Sayısal Simülasyon
📍Kapsam:Genişletilmiş Akademik Örneklem
⚙️Değişkenler:Alan Parametreleri

Abstract

Some environmental factors affecting the gross effi ciency of crude protein (GECP) were studied using 2824 records of 501 lactating Holstein cows. Th e eff ects of some independent variables on the GECP were tested using a general linear model analysis. Th e GECP was signifi cantly aff ected by parity and pregnancy stage and linearly related to dry matter intake, milk yield, milk fat, protein and lactose percentages, protein and lactose yields, dietary levels of net energy for lactation (NEL), crude protein (CP), ruminally undegradable protein (RUP), and ether extract (EE). Quadratic relation to the GECP with dietary levels of NEL, CP, RUP, and EE were also signifi cant. Th is study showed that high producing animals, especially high protein yielding cows are more effi cient users of dietary CP. Dietary requirements of NEL, RUP, and EE to maximize the GECP were estimated as 1.61 Mcal/kg, 7.14%, and 5.42%, respectively. In comparison to NRC estimations, it seems that more NEL, less CP, and more RUP are needed to maximize the protein effi ciency of lactating dairy cows.

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Bu Makaleye Atıf Yap

ZAMANI, P., AHMADI, A., MIRAEI-ASHTIANI, S. R., ALIARABI, H., SAKI, A. A., ZABOLI, K., ALIPOUR, D. (2022). Statistical evaluation of some environmental factors aff ecting the gross effi ciency of crude protein in high producing dairy cows. Turkish Journal of Veterinary and Animal Sciences, Cilt: 35 - Sayı: 2, 123–130. https://ajindex.com/articles/615349

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