Simultaneity between nutrition and thermoregulatory responses in ruminants

Ferreira, Josiel; Serafim, Maria Vitória; Diógenes, Géssica Vitalino; Silveira, Robson Mateus Freitas; Antas, Stela; Costa, Marcone Geraldo

doi:10.1080/09291016.2019.1629166

Cited by 17 publications

(2 citation statements)

References 31 publications

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“…Rectal temperature (RT) was the most sensitive indicator among the physiological responses, as mentioned by a few authors. ( Polsky and Von Keyserlingk, 2017 ; Ferreira et al., 2019 ). Activation of hypothalamic-pituitary-adrenal axis is one of the first physiological responses on exposing animal to stressful conditions, causing an immediate alteration in serum concentrations of T3 and T4 ( Façanha et al., 2013 ).…”

Section: Discussionmentioning

confidence: 99%

Adaptive profiles of Nellore sheep with reference to farming system and season: physiological, hemato-biochemical, hormonal, oxidative-enzymatic and reproductive standpoint

Karthik

Suresh

Reddy

et al. 2021

Heliyon

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This paper outlines the effect of farming systems with reference to season on the body condition score (BCS) and adaptive profile (physiological, hemato-biochemical, hormonal, enzymatic and reproductive parameters) of Nellore sheep. In trial 1, sixty ewe-lambs were allotted to extensive, semi-intensive, and intensive rearing systems (n = 20) and evaluated for BCS at puberty, mating, 2 weeks pre-lambing and 2, 4, 8, and 12 weeks post-lambing. In trial 2, eighteen rams were distributed evenly to three farming systems (n = 6) and evaluated for physiological, hemato-biochemical, hormonal, enzymatic, and reproductive parameters concerning three seasons. Although the scores did not differ among the groups, the Kruskal-Wallis ranks of BCS revealed a higher energy status of intensive ewes at different physiological conditions. The sheep reared under extensive and semi-intensive systems displayed higher temperature, pulse rate and respiratory rate with predominant effects in summer season. Similarly, both systems exhibited higher WBC and lower haemoglobin, PCV, and RBC contents without affecting MVC, MCH, MCHC, and differential leucocyte count. The percent haemoglobin and RBC count were higher in winter compared to summer months, whereas WBC count followed an exactly opposite pattern. The sheep reared in intensive system showed higher glucose, total protein, albumin, cholesterol, T3, T4, calcium, and phosphorus; however, the globulin, creatinine, uric acid, aspartate amino transferase (AST), alanine amino transferase (ALT), superoxide dismutase (SOD), malondialdehyde (MDA), glutathione peroxidase, and catalase levels were elevated in extensive and semi-intensive systems. The dartos muscle extension (DME) and scrotum sweating rate (SSR) were higher for the sheep reared under extensive system, especially during summer season; while the seminal parameters viz., total sperm count, progressive sperm motility, and plasma membrane integrity were lower for extensive and semi-intensive sheep. No interactions were noticed for any of the parameters, except for cortisol, DME, and SSR, which showed significant interactions for rearing system vs. season. Our results showed dynamic adaptive mechanisms of the Nellore sheep in relation to different stressors like grazing for long distances, inadequate nutrition, and heat stress, revealing the heat resilient ability in harsh environmental conditions. Further, the analyzed vector plot showed that the AST, GPx, Cortisol, SOD, Catalase, WBC, PR, T4, total abnormalities, and major abnormalities were the major contributors for adapting during combined stressors.

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Section: Discussionmentioning

confidence: 99%

Adaptive profiles of Nellore sheep with reference to farming system and season: physiological, hemato-biochemical, hormonal, oxidative-enzymatic and reproductive standpoint

Karthik

Suresh

Reddy

et al. 2021

Heliyon

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“…Additionally, RT is a variable of extreme relevance because its increase is indicative of caloric increment, associated to endogenous heat of the diet, according to Ferreira et al (2021), which is related to reduced animal performance when the rectal temperature is increased by 1.0ºC (McDowell et al, 1974). The variation observed for RT in this study remained within the normal range (38.84 -39.75ºC) (Bezerra et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Canopy structure, behavioral and physiological aspects of pasture-finished sheep using castor bean cake as alternative input

Meneses,

Pompeu,

Salles

et al. 2024

Arq. Bras. Med. Vet. Zootec.

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The purpose was to evaluate structural characteristics of pasture, behavioral aspects and physiological parameters of sheep finished on irrigated Tamani grass pasture under continuous stocking, using castor bean cake as alternative input. Structural characteristics of the pasture were assessed in a randomized block design in 2 x 2 factorial arrangement, with two sources of nitrogen fertilization (mineral - urea and organic - in natura castor bean cake) and two supplements (with or without detoxified castor bean cake), in four replications (paddocks). Behavioral aspects and physiological parameters were assessed in a randomized block design with four treatments, and repeated measures over time in eight replications (sheep). Total forage biomass, green leaf blade biomass, grazing, rumination, and idleness times, as well as respiratory rate and rectal temperature were assessed. Urea provided greater leaf blade biomass (1,807 kg DM.ha.cycle-1) and tiller population density (1,592 tillers.m-2). Grazing time reduced 65 minutes.day-1 for animals supplemented with detoxified castor bean cake and kept in pastures fertilized with urea. The use of castor bean cake did not change the physiological parameters of the animals in any of the managements evaluated and can be used as a strategic input in the finishing of sheep on pasture.

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