Impact of heat stress on conception rate of dairy cows in the moderate climate considering different temperature–humidity index thresholds, periods relative to breeding, and heat load indices

Schüller, L.K.; Burfeind, O.; Heuwieser, W.

doi:10.1016/j.theriogenology.2014.01.029

Cited by 182 publications

(151 citation statements)

References 41 publications

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“…More recently, Khan et al (2013) reported significantly lower CR in crossbred cows inseminated during heat stress period (>72 THI) compared to those inseminated during stress free condition. Similarly, lower CR has been observed in temperate breed Taurus cattle by several authors (Zi et al, 2003;Garcio-Ispierto et al, 2007;Morton et al, 2007;Schuller et al, 2014). The decrease PD-PR and CR during heat stress period may either be affected directly or indirectly.…”

Section: Pregnancy Diagnosis-positive Rate and Conception Ratementioning

confidence: 61%

Pregnancy diagnosis-positive rate and conception rate as indicator of farm reproductive performance

Abdullah

Mohanty

Patbandha

et al. 2015

IJAR

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The present study was designed to evaluate the Pregnancy Diagnosis-Positive Rate (PD-PR) along with conception rate (CR) in an organised farm (Livestock Research Centre, National Dairy Research Institute, Karnal) to take effective management decision. One year record of Artificial Insemination (A.I.) and PD of dairy animals (N=1327; comprised 1003 cows and 324 buffaloes) was analysed. On an average, cows and buffaloes were presented for per rectal pregnancy diagnosis after 75.63 (38-119) and 76.3 (46-128) days, respectively of A.I. Overall PD-PR value of cattle was observed to be significantly higher compared to buffaloes (70.77 and 59.45%, respectively, p<0.001). However, buffaloes showed a higher trend of overall CR compared to cattle (41.28 and 46.6%, respectively, p=0.092). PD-PR value were 14.23% and 25.55% less in cattle and buffaloes, respectively compared to the farm standard i.e, 85%. The PD-PR and CR value were observed to be higher during winter season both in cattle (77.42 and 47.86%, respectively) and buffaloes (69.23 and 60.00%, respectively). However, lower value of PD-PR and CR were observed during rainy in cattle (66.14 and 36.68%, respectively) and summer in buffaloes (50.98 and 36.11%, respectively). It was evident that heat stress along with humidity has negative effect on display of oestrus symptoms as well as on CR.

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Section: Pregnancy Diagnosis-positive Rate and Conception Ratementioning

confidence: 61%

Pregnancy diagnosis-positive rate and conception rate as indicator of farm reproductive performance

Abdullah

Mohanty

Patbandha

et al. 2015

IJAR

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“…Abbreviations: T db = dry-bulb temperature, RH = relative humidity, T dp = dew-point temperature, WS = wind speed, T bg = black globe temperature, THI = temperature-humidity index, BGHI = black globe-humidity index, HLI = heat load index, BT = body temperature, RR = respiration rate, MY = milk yield; 1 Calculated from Lawrence [43] if not given by the authors: RH = 100 × EXP[−5419(T db − T dp )/(T db + 273.15)/(T dp + 273.15)]; 2 Calculated from Lawrence [43] if not given by the authors: T dp = T db − [((100 − RH)/5)((T db + 273.15)/300) 2 ] − 0.00135(RH − 84) 2 + 0.35; 3 Calculated from Schüller et al [44] if not given by the authors: THI = (1.8T db + 32) − [(0.55 − 0.0055RH)(1.8T db − 26)]; 4 Calculated from Buffington et al [45]: BGHI = T bg + 0.36T dp + 41.5; 5 Calculated from Gaughan et al [46] if not given by the authors: HLI = IF[T bg > 25, 8.62 + (0.38RH)(1.55 T bg ) + EXP(2.4 − WS) − 0.5WS, 10.66 + (0.28RH) + (1.3T bg ) − WS]; 6 Body temperature refers to rectal temperature for studies in Florida and South Africa and to vaginal temperature for studies in New Zealand.…”

Section: Tablementioning

confidence: 99%

Practices for Alleviating Heat Stress of Dairy Cows in Humid Continental Climates: A Literature Review

Fournel

Ouellet

Charbonneau

2017

Animals

112

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Simple SummaryThe severity of heat stress issues on dairy cows will increase as global warming progresses. Fortunately, major advances in environmental management, including fans, misters, sprinklers, and cooled waterbeds, can attenuate the effects of thermal stress on cow health, production, and reproduction. These cooling systems were, however, tested in subtropical areas and their efficiency in northern regions is uncertain. This article assesses the potential of existing technologies to cool cows in humid continental climates through calculation of heat stress indices.AbstractHeat stress negatively affects the health and performance of dairy cows, resulting in considerable economic losses for the industry. In future years, climate change will exacerbate these losses by making the climate warmer. Physical modification of the environment is considered to be the primary means of reducing adverse effects of hot weather conditions. At present, to reduce stressful heat exposure and to cool cows, dairy farms rely on shade screens and various forms of forced convection and evaporative cooling that may include fans and misters, feed-line sprinklers, and tunnel- or cross-ventilated buildings. However, these systems have been mainly tested in subtropical areas and thus their efficiency in humid continental climates, such as in the province of Québec, Canada, is unclear. Therefore, this study reviewed the available cooling applications and assessed their potential for northern regions. Thermal stress indices such as the temperature-humidity index (THI) were used to evaluate the different cooling strategies.

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“…Climate change is one of the major threats for the sustainability of livestock production contributing to the decline in fertility in lactating dairy cows (De Rensis and Scaramuzzi, 2003; Dash et al, 2016). Several studies reported 20 to 30% reduction in conception rate (Schuller et al, 2014) and in pregnancy rate (Khan et al, 2013) in hot climatic condition. However, an air temperature above 25-37°C exceeds heat gain than their lost from the body and it induces heat stress in a tropical climate (Vale, 2007;Kumar et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

The Impact of Climate Change on Livestock Production and Reproduction: Ameliorative Management

Sinha¹,

Ranjan²,

Lone³

et al. 2017

Int. J. Livest. Res.

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Impact of heat stress on conception rate of dairy cows in the moderate climate considering different temperature–humidity index thresholds, periods relative to breeding, and heat load indices

Cited by 182 publications

References 41 publications

Pregnancy diagnosis-positive rate and conception rate as indicator of farm reproductive performance

Pregnancy diagnosis-positive rate and conception rate as indicator of farm reproductive performance

Practices for Alleviating Heat Stress of Dairy Cows in Humid Continental Climates: A Literature Review

The Impact of Climate Change on Livestock Production and Reproduction: Ameliorative Management

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