Heat stress, divergent nutrition level, and late pregnancy in hair sheep: effects upon cotyledon development and litter weight at birth

Tropical Animal Health and Production
César Alberto Meza-HerreraU Macías-Cruz

Abstract

The effect of two divergent nutritional levels during late pregnancy upon some physiological variables and the number (NC) and diameter (DC) of placental cotyledons along with litter weight at birth (LWB) on heat-stressed (42-45 °C) hair ewes was evaluated. Multiparous Katahdin x Pelibuey ewes (n = 24) at the onset of the 3/3 of pregnancy were randomly assigned to two treatments (n = 12): (1) non-nutritionally restricted (NNR) ewes, with free access to wheat straw plus 500 g/day of concentrate, and (2) nutritionally restricted (NR) ewes, receiving only wheat straw ad libitum. On days 100, 115, 130, and 145 of gestation, the body weight (BW), body condition score (BCS), rectal temperature (RT), respiration rate (RR) were registered in the afternoon (15:00) while the temperature-humidity index (THI) was calculated. At lambing, NC, DC, and LWB were also registered. Analyses considered a completely random design (CRD)-ANOVA with repeated measures across time, considering to litter size (LS) as covariable to reduce any possible influence of LS upon the response variables along experimental diets. BW and BCS were higher in NNR ewes at days 115, 130, and 145. Despite RT similarities (P < 0.05) between treatments, RR was greater (P < 0...Continue Reading

References

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Jun 5, 2013·Placenta·D BarkerG Davey-Smith
Nov 16, 2013·Journal of Thermal Biology·U Macías-CruzL Avendaño-Reyes

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Citations

Jul 8, 2020·Animals : an Open Access Journal From MDPI·Santiago Zuñiga-GarciaFrancisco G Veliz-Deras
May 13, 2017·International Journal of Biometeorology·Priscila Reis KahwageAlexandre Rossetto Garcia

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