Impact of thermal stress on the efficiency of ovulation synchronization protocols in Holstein cows

El‐Tarabany, Mahmoud S.; El-Tarabany, Akram A.

doi:10.1016/j.anireprosci.2015.08.002

Cited by 24 publications

(15 citation statements)

References 72 publications

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“…When maximum THI during three to one day pre-artificial insemination values were greater than 80, conception rate decreased from 30.6% to 23.0% [114]. The influence of THI on the conception, pregnancy, embryonic loss and early abortion rates in purebred Holstein cows under subtropical Egyptian conditions was studied by [115] and found that conception and pregnancy rates were significantly decreased from 31.6% and 26.3% at the lesser THI to 11.5% and 9.9%, respectively, than at the greater THI. Same authors found that conception and pregnancy rates were significantly reduced at either the lesser or greater THI while embryonic loss rate was significantly increased from 11.5% at the lesser THI to 22.2% at the greater THI.…”

Section: Relation Of Heat Stress (Thi) With Reproductive Efficiency Of Farm Animalsmentioning

confidence: 99%

Temperature-Humidity Indices as Indicators to Heat Stress of Climatic Conditions with Relation to Production and Reproduction of Farm Animals

Habeeb¹,

Gad²,

Atta³

2018

Int J Biotechnol Recent Adv

140

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The changes in the environmental factors like ambient temperature, relative humidity, wind speed and solar radiation causes stresses in lactating cattle. Heat stress is a condition in which the animal body has problems dissipating excess heat. Results of inadequate heat dissipation range from general discomfort to symptoms of heat rash, heat syncope, heat cramps, heat exhaustion and heat stroke. Heat stress assessment methods were carried out using some equations presented temperature-humidity index (THI) or heat stress index (HSI) or using different heat index charts. Temperature Humidity Index is calculated based on the relationship between environmental temperature and relative humidity. The heat stress index is a simple combination of temperature and humidity and has been designed as a measure of animal comfort. Heat Index Chart is a chart used by dairy producers to estimate the severity of heat stress of a dairy cow. This chart utilizes ambient temperature and relative humidity, which are readily available to the dairy producer on a daily basis and indicate from slight to severe heat stress of dairy cattle from some equations

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Section: Relation Of Heat Stress (Thi) With Reproductive Efficiency Of Farm Animalsmentioning

confidence: 99%

Temperature-Humidity Indices as Indicators to Heat Stress of Climatic Conditions with Relation to Production and Reproduction of Farm Animals

Habeeb¹,

Gad²,

Atta³

2018

Int J Biotechnol Recent Adv

140

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“…The ovysynch protocol can successfully synchronize ovulation in buffaloes and can also increase conception rate when combined with TAI [ 69 ]. The CIDRsynch and Presynch protocols are also applied to improve conception rate and pregnancy rate of Holstein cows under subtropical environmental conditions [ 70 ]. This TAI protocol can be able to reduce losses in reproductive efficiency in cattle and buffaloes caused by poor estrus detection in summer.…”

Section: Mitigation Strategies To Combat Heat Stressmentioning

confidence: 99%

Effect of heat stress on reproductive performances of dairy cattle and buffaloes: A review

Dash¹,

Chakravarty²,

Singh³

et al. 2016

Vet World

201

140

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Heat stress has adverse effects on the reproductive performances of dairy cattle and buffaloes. The dairy sector is a more vulnerable to global warming and climate change. The temperature humidity index (THI) is the widely used index to measure the magnitude of heat stress in animals. The objective of this paper was to assess the decline in performances of reproductive traits such as service period, conception rate and pregnancy rate of dairy cattle and buffaloes with respect to increase in THI. The review stated that service period in cattle is affected by season of calving for which cows calved in summer had the longest service period. The conception rate and pregnancy rate in dairy cattle were found decreased above THI 72 while a significant decline in reproductive performances of buffaloes was observed above threshold THI 75. The non-heat stress zone (HSZ) (October to March) is favorable for optimum reproductive performance, while fertility is depressed in HSZ (April to September) and critical HSZ (CHSZ) (May and June). Heat stress in animals has been associated with reduced fertility through its deleterious impact on oocyte maturation and early embryo development. The management strategies viz., nutrition modification, environment modification and timed artificial insemination protocol are to be strictly operated to ameliorate the adverse effects of heat stress in cattle and buffaloes during CHSZ to improve their fertility. The identification of genes associated with heat tolerance, its incorporation into breeding program and the inclusion of THI covariate effects in selection index should be targeted for genetic evaluation of dairy animals in the hot climate.

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“…The Ovsynch protocol successfully synchronized the ovulation in buffaloes and increased conception rate when combined with timed AI [100]. El-Tarabany and El-Tarabany [101] reported that the CIDRsynch and Presynch protocols improved the conception and pregnancy rate of Holstein cows under subtropical environmental conditions. Embryo transfer (ET) improves pregnancy rates during summer because embryos are transferred after the time at which they are more sensitive to heat stress.…”

Section: Hormonal Treatment and Assisted Reproductive Technologiesmentioning

confidence: 99%

Mitigation of the Heat Stress Impact in Livestock Reproduction

Krishnan¹,

Bagath²,

Pragna³

et al. 2017

Theriogenology

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Heat stress affects the fertility and reproductive livestock performance by compromising the physiology reproductive tract, through hormonal imbalance, decreased oocyte quality and poor semen quality, and decreased embryo development and survival. Heat stress decreases the secretion of luteinizing hormone and estradiol resulting in reduced length and intensity of estrus expression, increased incidence of anoestrus and silent heat in farm animals. Oocytes exposed to thermal stress lose its competence for fertilization and development into the blastocyst stage, which results in decreased fertility because of the production of poor quality oocytes and embryos. Furthermore, low progesterone secretion limits the endometrial functions, and subsequently embryo development. In addition, the increased secretion of endometrial prostaglandin F2 alpha during heat stress threatens the maintenance of pregnancy. In general, the percentage of conception rate was found to be reduced by 4.6% for each unit increase in temperature humidity index (THI) above 70, and heat stress during pregnancy further slows down the growth of the foetus and results in lower birth weight. In tropical and subtropical regions, during hot days, the testicular temperature may increase and impair both the spermatogenic cycle and semen quality, which culminates in decreased bull fertility. The effects of heat stress on livestock can be minimized via adapting suitable scientific strategies comprising physical modifications of the environment, nutritional management and genetic development of breeds that are less sensitive to heat stress. In addition, the summer infertility may be countered through advanced reproductive technologies involving hormonal treatments, timed artificial insemination and embryo transfer, which may enhance the chances for establishing pregnancy in farm animals.

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Impact of thermal stress on the efficiency of ovulation synchronization protocols in Holstein cows

Cited by 24 publications

References 72 publications

Temperature-Humidity Indices as Indicators to Heat Stress of Climatic Conditions with Relation to Production and Reproduction of Farm Animals

Temperature-Humidity Indices as Indicators to Heat Stress of Climatic Conditions with Relation to Production and Reproduction of Farm Animals

Effect of heat stress on reproductive performances of dairy cattle and buffaloes: A review

Mitigation of the Heat Stress Impact in Livestock Reproduction

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