Different levels of response to heat stress in dairy goats

Salama, A. A. K.; Caja, G.; Hamzaoui, S.; Badaoui, Bouabid; Castro-Costa, Andreia; Façanha, Débora Andréa Evangelista; Guilhermino, Magda Maria; Bozzi, Rıccardo

doi:10.1016/j.smallrumres.2013.11.021

Cited by 157 publications

(146 citation statements)

References 40 publications

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“…The natural environment to which the animals are exposed, along the year, can cause heat stress. According to Salama et al (2014), in heat stress situations, ambient temperature is normally greater than skin temperature, which causes a high load, as animals tend to gain heat by convection and radiation. In these cases, water evaporation is the most efficient way to dissipate heat to maintain internal temperature within the normal range; this occurs by respiratory system and sweating.…”

Section: Resultsmentioning

confidence: 99%

Thermoregulatory responses related to coat traits of Brazilian native ewes: an adaptive approach

Leite

Façanha

Costa

et al. 2017

Journal of Applied Animal Research

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Semi-arid conditions can adversely affect livestock productivity and change certain physiological parameters. The relationship between hair coat and thyroxine levels in Morada Nova ewes was evaluated through environmental factors, such as air temperature, relative air humidity, radiant and Black Globe Humidity Index to gain a better understanding of thermoregulation mechanisms in these animals. Measurements were taken from July to January in 383 Morada Nova ewes. The variables studied included rectal temperature (RT), respiratory rate (RR), coat thickness (CT), hair length (HL), hair diameter (HD), hair density (D) and thyroid hormones. The data underwent multivariate statistical analyses and a significant inverse relationship was found between coat traits and Thyroxine (T 4 ). The animals that exhibited greater HL, coat density and CT showed lower T 4 concentrations. Coat traits showed a strong interaction with physiological mechanisms and can be considered relevant in maintaining homeostasis. Hair traits play an important role in this process, since T 4 reduction was stronger in animals that showed difficulties in eliminating heat, which were the ones that had greater HL, hair density and HD. By contrast, animals with a hair coat more favourable to heat losses had higher levels of thyroid hormones. ARTICLE HISTORY

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Section: Resultsmentioning

confidence: 99%

Thermoregulatory responses related to coat traits of Brazilian native ewes: an adaptive approach

Leite

Façanha

Costa

et al. 2017

Journal of Applied Animal Research

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“…Some authors have suggested that, to cope with the lack of energy due to decreased feeding, goats do not mobilise body fat, but change the rumen fermentation and rumen volatile FA profile (Salama et al 2014).…”

Section: Discussionmentioning

confidence: 99%

Effects of season on the quality of Garfagnina goat milk

Salari

Altomonte

Ribeiro

et al. 2016

Italian Journal of Animal Science

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The Garfagnina goat is an endangered native goat population from Italy. This study aims to give a contribution to the milk quality assessment of the native goat during the two productive seasons, spring and summer, and to verify the relationships between some meteorological data and physiological and milk quality parameters. Individual milk samples were taken in the two seasons. Physiological parameters and meteorological data were also registered. All the milk samples were measured for volume and analysed for: dry matter, total nitrogen, casein, ash, lactose, fat, milk fatty acid (FA) composition, number and diameter of the fat globules, and rheological parameters. There were not differences in the average diameter of the milk fat globules (2.27 ± 0.28 lm) and in milk gross composition between the two seasons, except for lactose which was significantly lower in summer. During summer a significant increase in some longchain FAs such as CLA c9,t11, C18:1 t11, C18:0, C18:3 n3, C20:0, C22:0, C22:2 was observed, whereas short-chain FAs (C6:0, C8:0, C10:0), which are responsible for the development of unpleasant aromas, as well as monounsaturated C16:1, C17:1 c9, C20:1, C22:1 and polyunsaturated FAs C20:2, C20:3 n3 decreased. The average PUFA n6/PUFA n3 ratio was 1.7 and the lowest values were recorded in summer. In summer a worsening of the clot, which was less firm, was found. Environmental parameters were found to be linked to the milk FAs, while heart rate and skin temperature were negatively linked to milk yield and lactose, respectively. ARTICLE HISTORY

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“…Heat stress and humidity alter the physiology of livestock, making animals more susceptible to disease and stress [68,74]. Variability in temperatures result in pronounced impacts on reproductive performance of animals such as decreased fertility, conception rate, and longevity [74].…”

Section: Climate Change Impacts On Livestockmentioning

confidence: 99%

Livestock Under Climate Change: A Systematic Review of Impacts and Adaptation

Escarcha

Lassa

Zander

2018

Climate

108

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Abstract:We conducted a systematic literature review to document the scientific knowledge about climate change impacts and adaptation in livestock systems, and to identify research gaps. The analysis was built from the premise that livestock offers substantial opportunities for food security and sustainable development if adaptation to climate change is appropriated. In examining 126 suitable peer-reviewed publications we discovered five research gaps: (1) a lack of research in Asia and South America; (2) a lack of mutual investigation and linkages between impacts and adaptation; (3) a lack of emphasis on mixed crop-livestock systems; (4) a lack of emphasis on monogastric livestock; and (5) an underrepresentation of quantitative methods including yield impact models. The findings suggest that the research on climate change impacts and adaptation in livestock systems needs to move beyond certain geographical contexts and consider key vulnerability priorities, particularly from developing countries. It is pivotal that research begins to jointly look at climate change impacts and the livestock keepers' adaptation to draw out policy implications and to effectively target support for impact-specific adaptation options. Only if such evidence is established, adaptation will be appropriated accordingly to the needs of the livestock sector, and provision for the growing demand of animal-based products will be secured.

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Different levels of response to heat stress in dairy goats

Cited by 157 publications

References 40 publications

Thermoregulatory responses related to coat traits of Brazilian native ewes: an adaptive approach

Thermoregulatory responses related to coat traits of Brazilian native ewes: an adaptive approach

Effects of season on the quality of Garfagnina goat milk

Livestock Under Climate Change: A Systematic Review of Impacts and Adaptation

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