Heat index based identification of critical heat stress zone for production traits in murrah Buffalo under subtropical climate

IF 1 4区生物学 Q3 BIOLOGY Biological Rhythm Research Pub Date : 2023-01-29 DOI:10.1080/09291016.2023.2171225

R. Behera, A. Chakravarty, N. Kashyap, A. Sahu, B. Deshmukh, Soumya Dash

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Abstract

ABSTRACT Novel study on identification of critical heat stress zone (CHSZ) taking 20 years data was carried out in Indian buffaloes considering the effect of temperature humidity index-THI on milk production and composition traits. More than 3 lakh daily milk yield records (DMY); 9864 records each of monthly test day fat% (MTDF%) and SNF% (MTDSNF%) and meteorological data were collected from ICAR-NDRI and ICAR-CSSRI, Karnal, respectively. THI model [THI = (0.55× Tdb + 0.2× Tdp) × 1.8 + 32 + 17.5] by National Research Council in 1971 was used for computing THI. The year was classified into: Heat Stress Zone (HSZ) and Non-Heat Stress Zone (NHSZ) based on the trends of rising THI and declining milk production and composition traits. For DMY, NHSZ was 1st October to 9th April and HSZ was 10th April-30th September. For composition traits, October-March was NHSZ and April-September the HSZ. Within the HSZ regression analysis was conducted to find the zone where maximum drop in traits occur per unit rise in THI. A maximum decline in DMY 92.20 gram was observed during 15th August-14th September; identified as CHSZ for DMY. Similarly, maximum drop in MTDF% (b = −0.052) and MTDSNF% (b = −0.0114) observed during July-August, considered as CHSZ.

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基于热指数的亚热带气候下水牛生产性状临界热应力区的识别

摘要利用20年的数据对印度水牛进行了临界热应激区(CHSZ)的鉴定，考虑了温度湿度指数(thi)对产奶量和成分性状的影响。超过30万个日产奶量记录(DMY);每月试验日脂肪% (MTDF%)和SNF% (MTDSNF%)记录和气象资料分别来自ICAR-NDRI和ICAR-CSSRI, Karnal。采用1971年国家研究委员会的THI模型[THI = (0.55× Tdb + 0.2× Tdp) × 1.8 + 32 + 17.5]计算THI。根据THI上升趋势和产奶量下降趋势及成分特征，将年份分为热应激区(HSZ)和非热应激区(NHSZ)。对于DMY, NHSZ为10月1日至4月9日，HSZ为4月10日至9月30日。在组成性状上，10 ~ 3月为非高值区，4 ~ 9月为高值区。在HSZ内进行回归分析，找出THI每单位上升时性状下降最大的区域。8月15日- 9月14日DMY最大降幅为92.20 g;为DMY识别为CHSZ。同样，7 - 8月MTDF% (b = - 0.052)和MTDSNF% (b = - 0.0114)的最大降幅被认为是CHSZ。

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来源期刊

Biological Rhythm Research 生物-生理学

CiteScore

3.00

自引率

9.10%

发文量

审稿时长

6-12 weeks

期刊介绍： The principal aim of Biological Rhythm Research is to cover any aspect of research into the broad topic of biological rhythms. The area covered can range from studies at the genetic or molecular level to those of behavioural or clinical topics. It can also include ultradian, circadian, infradian or annual rhythms. In this way, the Editorial Board tries to stimulate interdisciplinary rhythm research. Such an aim reflects not only the similarity of the methods used in different fields of chronobiology, but also the fact that many influences that exert controlling or masking effects are common. Amongst the controlling factors, attention is paid to the effects of climate change on living organisms. So, papers dealing with biometeorological aspects can also be submitted. The Journal publishes original scientific research papers, review papers, short notes on research in progress, book reviews and summaries of activities, symposia and congresses of national and international organizations dealing with rhythmic phenomena.