Performance of high-yielding dairy cows supplemented with fat or concentrate under hot and humid climates

Journal of Dairy Science
U MoallemA Arieli

Abstract

Multiparous Israeli-Holstein cows (n=42) averaging 158 d in milk and 621 kg of body weight were used to investigate the effects of energy source (fat or concentrate) on production, rumination time, energy balance, metabolic heat production, and efficiency under hot and humid conditions. Cows were assigned to 3 diet treatment groups: a lactating-cow ration (1.75 Mcal of net energy for lactation/kg of dry matter (DM; control); supplemented with 0.825 kg/d per cow of ground corn grain (2.7% of diet; HG); or supplemented with 0.300 kg/d per cow of calcium salts of fatty acids (1.5% of diet; HF). Milk production, body weight, and rumination time were recorded daily. Rectal temperature and respiratory rate (RR) were measured weekly. Mean daily maximum ambient temperature, relative humidity, and temperature-humidity index were 31.5 degrees C, 86.6%, and 76.8, respectively. Dry matter intake was lower in HF and HG cows than in controls. Average daily rumination time was lowest in the HG group: 393.0, 377.7, and 390.8 min/d for control, HG, and HF cows, respectively. Milk production was higher in the control group than in the HG group; milk fat content was 0.38 units higher and fat yield was 11% greater in HF cows than in HG cows. Fat-c...Continue Reading

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Citations

Oct 25, 2016·Animal Science Journal = Nihon Chikusan Gakkaihō·Fangquan YanTianhai Yan
Sep 17, 2013·Journal of Dairy Science·H N PhuongP Schmidely
May 23, 2015·Animal : an International Journal of Animal Bioscience·E F VizzottoC M McManus
Jul 26, 2019·Journal of Animal Physiology and Animal Nutrition·Nima NaderiMorteza Hosseini Ghaffari
Jun 21, 2019·International Journal of Biometeorology·Li MinGang Wang
Aug 20, 2014·Tropical Animal Health and Production·Steffan Edward Octávio OliveiraLeonardo Lelis de Macedo Costa
Feb 7, 2020·Animal : an International Journal of Animal Bioscience·M Gauly, S Ammer
Nov 14, 2019·Tropical Animal Health and Production·Othman AlqaisiWaleed Al-Marzooqi
Dec 3, 2016·Frontiers in Zoology·Sarah A OhrnbergerTeresa G Valencak
Jun 6, 2017·Animal : an International Journal of Animal Bioscience·R MorettiR Bozzi
Jan 17, 2017·International Journal of Biometeorology·Kalyan DeSyed Mohammed Khursheed Naqvi
Feb 2, 2021·Animal : an International Journal of Animal Bioscience·H LevitI Halachmi
Aug 23, 2021·Journal of Dairy Science·R Held-MontaldoP Sepúlveda-Varas

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