Changes in embryo production results and ovarian recrudescence during the acclimatisation to the semiarid tropics of embryo donor Holstein–Friesian cows raised in a temperate climate

Bényei, Balázs; Gáspárdy, András; Barros, C.

doi:10.1016/s0378-4320(01)00144-0

Cited by 13 publications

(3 citation statements)

References 35 publications

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“…Algier, Marocco or Tunisia (DHV 2012). Bényei et al (2001) summarized the problems animals have to overcome when moving from temperate to tropical climates: transport stress, change of ambient temperature, change in seasonal day length patterns, change in diet, and new management routines. A moderate antagonistic relationship between general production and heat tolerance on the genetic scale was verified by .…”

Section: Introductionmentioning

confidence: 99%

Defining and evaluating heat stress thresholds in different dairy cow production systems

Gernand²,

et al. 2012

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The aim of this study was to assess the impact of heat stress in dairy cows on test-day records for production traits and somatic cell score (SCS) in the state of Lower Saxony, Germany. Three different production systems were defined: A production system characterized by intensive crop production (=indoor housing), a pasture based production system, and a maritime region. Heat stress was assessed by two temperature-humidity indices (THI) modelled as random regression coefficients in an analysis of variance: One (THI Bo ) was defined as an average of hourly THI, calculated from hourly recorded temperatures and humidities, the other (THI Ra ) was based on daily maximal temperature and daily minimal humidity. In all production systems, THI Bo =60 and THI Ra =70 were identified as general thresholds denoting a substantial decline in test-day milk yield. For daily fat and protein percentage, no universally valid thresholds were identified. In contrast for SCS, especially in the maritime region, heat stress as well as cold stress thresholds were found. Regression analysis was used to study the change in test day milk yield in response to THI of those THI ranges with an obvious decline in milk yield. Regression coefficients were −0.08 kg/THI Bo and −0.16 kg/THI Ra for the crop production system, −0.17 kg/THI Bo and −0.23 kg/THI Ra for the pasture based system, and −0.26 kg/THI Bo and −0.47kg/THI Ra for the maritime region. Based on statistical information criteria, identified thresholds for THI Bo should be given preference over THI Ra when applying genetic studies on heat stress in German Holstein cows.

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Section: Introductionmentioning

confidence: 99%

Defining and evaluating heat stress thresholds in different dairy cow production systems

Gernand²,

et al. 2012

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“…Abnormal profiles of progesterone as well as prolactin (PRL) may induce infertility in buffaloes during a hot summer [ 13 ]. Heat stress has also been associated with impaired embryo development and increased embryo mortality in cattle [ 14 , 15 , 16 ]. Understanding the physiological differences in endometrial function between summer and autumn might help to determine a way to improve reproductive efficiencies and reduce the number of defective fetuses.…”

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confidence: 99%

Comparison of the global gene expression profiles in the bovine endometrium between summer and autumn

Sakumoto

Hayashi

Saito

et al. 2015

Journal of Reproduction and Development

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Heat stress compromises fertility during summer in dairy and beef cows by causing nutritional, physiological and reproductive damages. To examine the difference in endometrial conditions in cows between summer and autumn, gene expression profiles were compared using a 15 K bovine oligo DNA microarray. The trial was conducted in the summer (early in September) and autumn (mid-November) seasons of two consecutive years (2013–2014) in Morioka, Japan. Endometrial samples were collected from the cows using a biopsy technique. The expressions of 268 genes were significantly higher in the endometrium collected in summer than those collected in autumn, whereas the expressions of 369 genes were lower (P<0.05 or lower). Messenger RNA expressions of glycoprotein 2 (GP2), neurotensin (NTS),E-cadherin (CDH1) and heat shock 105kDa/110kDa protein 1 (HSPH1) were validated by quantitative real-time PCR. Transcripts of GP2 and NTS were more abundant in the endometrium from summer than in the endometrium from autumn (P < 0.05). In contrast, the mRNA expressions of CDH1 were lower (P < 0.05) and those of HSPH1 tended to be low (P = 0.09) in the endometrium from summer. Immunohistochemical staining showed that GP2, NTS and HSPH1 were expressed in the endometrial epithelial or glandular epithelial cells. The serum concentrations of NTS collected from the cows in summer were higher than those collected from cows in autumn (P < 0.05). Collectively, the different gene expression profiles may contribute to functional differences in the endometrium between summer and autumn, and the increases in GP2 and NTS may have a relationship with the endometrial deficiency that causes infertility of cows in summer.

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“…In this sense, Hansed [ 19 ] mentions that HS can affect the reproductive axis, even weeks before ovulation, by compromising follicular function and ovogenesis, which in turn compromises oocyte competence and therefore fertilization, resulting in embryonic development problems up to the blastocyst stage. Research related to the effect of HS on the conception rate of embryos developed by in vivo techniques in dairy cattle [ 20 ] and beef cattle [ 21 ] has been carried out. Unfortunately, these investigations, although they have contributed significantly to the understanding of the mechanisms related to embryonic development, present certain limitations because these evaluations have been carried out with embryos produced in vivo, but in relation to embryos developed and produced in vitro, the information is scarce.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Month of Harvesting and Temperature–Humidity Index on the Number and Quality of Oocytes and In Vitro Embryo Production in Holstein Cows and Heifers

Morales-Cruz,

Calderon-Leyva,

Angel-García

et al. 2023

Biology

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The aim of this study was to evaluate the effect of the month of oocyte harvesting and the temperature–humidity index on oocyte number and quality harvested from Holstein cows and heifers, oocyte developmental competence, and total embryos produced in an area of intense ambient temperature for most of the year. A total of 5064 multiparous lactating cows and 2988 nulliparous heifers were used as oocyte donors and distributed across the months of the year. Overall, total oocytes per collection did not differ (p > 0.05) between cows (16.6 ± 2.7) and heifers (15.1 ± 1.8), but oocyte developmental competence was lower (p < 0.05) in cows (21.3 ± 5.4) than heifers (25.5 ± 4.0). For cows, the total number of oocytes harvested was two-fold higher (p < 0.05) in November than in May. For heifers, the total number of oocytes harvested was highest in April (17.19 ± 0.53) and lowest in May (10.94 ± 0.32; p < 0.05). For cows, total embryos were highest in November (2.58 ± 0.42) and lowest in August (1.28 ± 0.10; p < 0.05). Thus, taken together, these results indicate that severe heat stress impaired the number and quality of oocytes harvested from donor Holstein multiparous cows and heifers, oocyte developmental competence, and total embryos produced in this area of intense ambient temperature for most of the year.

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Changes in embryo production results and ovarian recrudescence during the acclimatisation to the semiarid tropics of embryo donor Holstein–Friesian cows raised in a temperate climate

Cited by 13 publications

References 35 publications

Defining and evaluating heat stress thresholds in different dairy cow production systems

Defining and evaluating heat stress thresholds in different dairy cow production systems

Comparison of the global gene expression profiles in the bovine endometrium between summer and autumn

The Effect of Month of Harvesting and Temperature–Humidity Index on the Number and Quality of Oocytes and In Vitro Embryo Production in Holstein Cows and Heifers

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