Heat stress and milk production in the first parity Holsteins – threshold determination in eastern Croatia

Gantner, Vesna; Mijić, Pero; Kuterovac, Krešimir; Barać, Zdravko; Potočnik, Klemen

doi:10.18047/poljo.21.1.sup.22

Cited by 14 publications

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“…In temperate climatic conditions, heat stress in dairy cattle during certain times of the year is also a major concern for the dairy industry as it has detrimental effects on feed intake, growth efficiency, production and reproduction of animals (Ravagnolo et al ., 2000; West et al ., 2003; Gantner et al ., 2015). In the tropical and sub-tropical climatic conditions found in India, the susceptibility of dairy animals to heat stress would be even higher as the average annual temperature in most parts is 25 °C or higher, that is at or above the thermal-comfort zone for maximum productive performance of these animals (Sirohi and Michaleowa, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the better suitability of buffaloes to hot-humid conditions is also reflected in higher critical THI (by 2-3 points) than purebred Bos taurus cows and their crosses. The thermoneutral level of THI is influenced by many factors including the adaptation level of animals, farm management or housing specialities, nevertheless, empirical evidence shows that stress level for dairy cows sets in at a substantially lower THI of 68 as reported by Gantner et al (2015) for the first parity Holsteins in eastern Croatia. Bouraoui et al (2002) observed THI value 69 as threshold value in a Mediterranean climate and Zewdu et al (2014) in their study in Maharashtra (India) reported that crossbred dairy cattle were exposed to heat stress when THI crosses the level 72.…”

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confidence: 95%

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Sensitivity of buffaloes (Bubalus bubalis) to heat stress

Choudhary

Sirohi

2019

Journal of Dairy Research

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Based on ten years of data (2001–10), consisting of 12 673 observations on fortnightly milk yield of buffaloes reared in a dairy farm located in the Northern sub-tropics (29°41′0″N, 76°59′0″E), the present study establishes the relationship between weather conditions and production performance of lactating buffaloes. The critical threshold level of maximum temperature-humidity index (THI) was estimated to be 74, which is higher than that of crossbred cows. The duration of discomfort period for buffaloes begins in mid-March and lasts up to early November. During the aggravated stress condition (THI > 82) prevailing in the region for about 5 months starting from early May, milk productivity declines by more than 1% per unit increase in maximum THI over 82. The maximum temperature and minimum humidity (viz. maximum THI) are the most critical weather parameters causing thermal stress in animals, however, the climatic conditions in the region are such that not only maximum but also minimum THI crosses the critical threshold providing little relief to the animals during the night.

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Section: Introductionmentioning

confidence: 99%

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confidence: 95%

Sensitivity of buffaloes (Bubalus bubalis) to heat stress

Choudhary

Sirohi

2019

Journal of Dairy Research

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“…Bouraoui et al (2002) in a Mediterranean climate observed decrease in milk production of dairy cows in condition characterised with THI ≥ 69. In the environmental conditions of Eastern Croatia that characterise more extreme weather comparable to the Central, THI threshold value for the first parity Holsteins was set to 68, with the highest drop of 0.716 kg/day if THI =74 (Gantner et al, 2015). Du Preez et al (1990a, b) determined that dairy cows in Southern African conditions are affected by heat stress when THI values are higher than 72.…”

Section: Methodsmentioning

confidence: 99%

Heat Stressed Holstein Heifers - Threshold Determination in Central Croatia

Gantner¹,

Mijić²,

Kuterovac³

et al. 2019

JASBIH

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In the light of increasingly rapid climate change worldwide, and with the purpose of reduction of financial losses of dairy farmers and enabling the sustainable farming, the necessity of implementation of breeding values for heat resistance in breeding strategies, have become more and more pronounced. Estimation of breeding values requires determination of THI threshold value. Therefore, the objective of this research was to determine the THI threshold value for Holstein heifers in environmental conditions in Central Croatia. With that purpose individual test-day records of Holstein heifers with records of ambient temperature and relative humidity in the barns collected in regular milk recording from January 2006 to December 2012 were analysed. The THI threshold values for daily milk yield were determined by least square analyses of variance for each given THI value (from 65 to 76) using the PROC MIXED (SAS). The THI ≥ 65 cause significant change in Holstein heifers’ daily production. Significant decrease of daily milk yield was observed at THI = 65 with estimated drop from 0.087 till 0.254 kg milk/day (THI from 65 – 76). The THI = 65, as the lowest value at which significant decrease in daily milk yield was determined was taken as the threshold value for Holstein heifers in Central Croatia.

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“…It is widely accepted in the international literature that THI=72 is the starting point of stress in dairy cattle, thereafter, milk yield, fat and protein content starts to decrease (Du Preez et al, 1990;Armstrong, 1994;Ravagnolo and Misztal, 2000;Bouraoui et al, 2002;West et al, 2003;Chase, 2006;Bernabucci et al, 2014;Sinha et al, 2017). Some studies also claimed that this threshold is lower for high producing dairy cattle (Armstrong, 1994;Berman, 2005;Collier et al, 2012;Gantner et al, 2015). The yield losses calculated by the researchers as a result of the increase in THI; 0.18-0.36lt/day for Poland (THI>72), 0.41 lt/day for Tunisia (THI>69), 0.2 lt/day for the US (THI>72), 0.24-0.716 lt/ day (THI from 68 to 76) for Croatia (Ravagnolo and Misztal, 2000;Bouraoui et al, 2002;Herbut and Angrecka, 2012;Gantner et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Some studies also claimed that this threshold is lower for high producing dairy cattle (Armstrong, 1994;Berman, 2005;Collier et al, 2012;Gantner et al, 2015). The yield losses calculated by the researchers as a result of the increase in THI; 0.18-0.36lt/day for Poland (THI>72), 0.41 lt/day for Tunisia (THI>69), 0.2 lt/day for the US (THI>72), 0.24-0.716 lt/ day (THI from 68 to 76) for Croatia (Ravagnolo and Misztal, 2000;Bouraoui et al, 2002;Herbut and Angrecka, 2012;Gantner et al, 2015). In the United States of America, a total loss of $ 2.36 billion/year due to heat stress has been estimated from the livestock sector and dairy production loss took the highest share (St-Pierre et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

The Effect of Climate Change on the Cost of Dairy Farms in Turkey; Case Study of Thrace Region

Koç

Uzmay

2019

New Medit

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In Turkey, studies investigating the economic effects of climate change on agriculture are limited and there is little or no research that focuses on livestock production as regards changes in climate. In this context, the main objective of this research is to analyze the impacts of climate change on dairy cattle farms in terms of costs, according to different future scenarios and farms scales. Interviews were conducted with 140 dairy farmers in Thrace Region. To analyze the change in costs, the model developed by Calil et al. (2012) was used. According to the results of cost analysis, it was determined that climate change will lead to a 10-50% cost increase on dairy farms by the year 2044. The heat stress is responsible for 48-71% of the increase in the cost of production, where 24-52% is due to an increase in feed prices. Based on the outcome of this research, it was suggested that agricultural extension activities should be carried out in order for farms to get adapted to climate change. Agricultural supports and investment projects should be related to climate change.

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Heat stress and milk production in the first parity Holsteins – threshold determination in eastern Croatia

Cited by 14 publications

References 0 publications

Sensitivity of buffaloes (Bubalus bubalis) to heat stress

Sensitivity of buffaloes (Bubalus bubalis) to heat stress

Heat Stressed Holstein Heifers - Threshold Determination in Central Croatia

The Effect of Climate Change on the Cost of Dairy Farms in Turkey; Case Study of Thrace Region

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