The effects of ambient temperature and humidity on pregnancy rate in Beefmaster cows in a subtropical environment of Mexico

Mellado, M.; Romero, Paco; García, José Eduardo; Véliz, Francisco Gerardo; Arévalo, José Ramón

doi:10.1016/j.livsci.2010.03.009

Cited by 5 publications

(2 citation statements)

References 42 publications

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“…The lowest average pregnancy rate of Murrah buffaloes was obtained under CHSZ as compared to the HSZ and NHSZ along with the decrease in number of buffaloes from NHSZ to the CHSZ. Mellado et al (2010) indicated the variation in the pregnancy rate of Beefmaster cows in different seasons in a year. The lowest pregnancy rate was observed as o.44±0.02 in April–June (spring) while October–December (fall) months showed peak pregnancy rate 0.62±0.02 in Beefmaster cows.…”

Section: Discussionmentioning

confidence: 99%

Influence of Temperature and Humidity on Pregnancy Rate of Murrah Buffaloes under Subtropical Climate

Dash

Chakravarty

Sah

et al. 2015

Asian Australas. J. Anim. Sci

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Heat stress has adverse effects on fertility of dairy animals. Decline in fertility is linearly associated with an increase in combination of both temperature and humidity. The purpose of this study was to investigate the relationship between temperature humidity index (THI) and the pregnancy rate of Murrah buffaloes in a subtropical climate. The effects of genetic and non-genetic factors viz., sire, parity, period of calving and age group at first calving were found non-significant on pregnancy rate. The effect of THI was found significant (p<0.001) on pregnancy rate of Murrah buffaloes calved for first time and overall pregnancy rate. The threshold THI affecting the pregnancy rate was identified as THI 75. The months from October to March showed THI<75 and considered as non heat stress zone (NHSZ), while months from April to September were determined as heat stress zone (HSZ) with THI≥75. The lowest overall pregnancy rate (0.25) was obtained in July with THI 80.9, while the highest overall pregnancy rate (0.59) was found in November with THI 66.1. May and June were identified as critical heat stress zone (CHSZ) within the HSZ with maximum decline (−7%) in pregnancy rate with per unit increase in THI. The highest overall pregnancy rate was estimated as 0.45 in NHSZ with THI value 56.7 to 73.2. The pregnancy rate was found to have declined to 0.28 in HSZ with THI 73.5 to 83.7. However, the lowest pregnancy rate was estimated as 0.27 in CHSZ with THI value 80.3 to 81.6.

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Section: Discussionmentioning

confidence: 99%

Influence of Temperature and Humidity on Pregnancy Rate of Murrah Buffaloes under Subtropical Climate

Dash

Chakravarty

Sah

et al. 2015

Asian Australas. J. Anim. Sci

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“…When the heat loss is overrun by heat gain, the homeostatic mechanism triggers the thermoregulatory response of animal to maintain the body temperature within normal range. During heat stress, increase in the core body temperature due to failure of homeostatic mechanism reduces productivity of the animals below their original genetic potential in growth [ 1 ], milk production [ 2 - 4 ], milk constituents, [ 5 , 6 ] and reproduction [ 7 - 10 ].…”

Section: Introductionmentioning

confidence: 99%

Association of ATP1A1 gene polymorphism with thermotolerance in Tharparkar and Vrindavani cattle

et al. 2015

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Aim:One of the major biochemical aspects of thermoregulation is equilibrium of ion gradient across biological membranes. Na+/K+-ATPase, a member of P type-ATPase family, is a major contributor to the mechanism that actively controls cross-membrane ion gradient. Thus, we examined ATP1A1 gene that encodes alpha-1 chain of Na+/K+-ATPase, for genetic polymorphisms.Materials and Methods:A total of 100 Vrindavani (composite cross strain of Hariana x Holstein-Friesian/Brown Swiss/Jersey) and 64 Tharparkar (indigenous) cattle were screened for genetic polymorphism in ATP1A1 gene, using polymerase chain reaction single-strand conformation polymorphism and DNA sequencing. For association studies, rectal temperature (RT) and respiration rate (RR) of all animals were recorded twice daily for 3 seasons.Results:A SNP (C2789A) was identified in exon 17 of ATP1A1 gene. Three genotypes namely CC, CA, and AA were observed in both, Vrindavani and Tharparkar cattle. The gene frequencies in Tharparkar and Vrindavani for allele A were 0.51 and 0.48, and for allele C were 0.49 and 0.52, respectively, which remained at intermediate range. Association study of genotypes with RT and RR in both cattle population revealed that the animals with genotype CC exhibited significantly lower RT and higher heat tolerance coefficient than CA and AA genotypes.Conclusion:Differential thermoregulation between different genotypes of ATP1A1 gene indicate that the ATP1A1 gene could be potentially contributing to thermotolerance in both, Tharparkar, an indigenous breed and Vrindavani, a composite crossbred cattle.

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The impact of extreme weather events on livestock populations: the case of the 2011 drought in Mexico

Murray‐Tortarolo

Jaramillo

2019

Climatic Change

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The effects of ambient temperature and humidity on pregnancy rate in Beefmaster cows in a subtropical environment of Mexico

Cited by 5 publications

References 42 publications

Influence of Temperature and Humidity on Pregnancy Rate of Murrah Buffaloes under Subtropical Climate

Influence of Temperature and Humidity on Pregnancy Rate of Murrah Buffaloes under Subtropical Climate

Association of ATP1A1 gene polymorphism with thermotolerance in Tharparkar and Vrindavani cattle

The impact of extreme weather events on livestock populations: the case of the 2011 drought in Mexico

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