Effect of Temperature-Humidity-Index on Milk Performances of Local Born Holstein Dairy Cows Under Saharan Climate
Author:
Ouarfli Lazoumi1, Chehma Abdelmadjid2
Affiliation:
1. Département de sciences agronomiques, Faculté des sciences de la nature et de la vie et sciences de la terre, Université de Ghardaia , BP 455, Ghardaia, 47000 , Algérie 2. Université Kasdi Merbah -Ouargla (Algérie), Laboratoire de Bio ressources sahariennes . Préservation et valorisation 30000 Ouargla , Algérie .
Abstract
Abstract
The objective is to study the effect of heat stress on milk yield (MY) relative to milking records (n=18178) of native Holsteins (n=187), in the region of Ghardaia, according to periods of HS, using the temperature-humidity index (THI). With THI >72 during 07 months in the study area, which significantly (P<0.001) decrease the MY (-15.5% corresponding to 21.73 kg). Also, calving periods led to a significant drop (P < 0.001) in overall MY (7030.35 kg) of the order of (-14.6%), and over the lactation length (353.43 d), which explains 41% of the variations in MY. In addition, the non-significant effect (P=0.212) of the lactation range on the increase in MY, moreover, the lactation length shows a non-significant (P = 0.108) decrease (-4.68%) during heat stress (HS). Furthermore, the significant effect (P <0.001) of the interaction (Milking frequency × THI) on MY, when THI variates from < 74 to > 84, with regression of (-16.82% and -08.82%) of the MF (2X and 3X), respectively. Again, the NH cow is less sensitive to hyperthermia, so THI explains only 2% of the variation in MY levels. Thus, NH in arid regions have the ability to acclimatize to Saharan environmental conditions.
Publisher
Walter de Gruyter GmbH
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