Ethology, physiological, and ingestive responses of sheep subjected to different temperatures and salinity levels of water

Leite, Patrício Gomes; Marques, Jordânio Inácio; Furtado, Dermeval Araújo; Neto, José Pinheiro Lopes; Souza, Bonifácio Benício de; Nascimento, José Wallace Barbosa do

doi:10.1007/s00484-019-01724-y

Cited by 11 publications

(11 citation statements)

References 17 publications

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“…These findings are similar to those of Thomas et al [39], who reported that sheep had a lower horizontal travel velocity and did not travel as far from water on warmer days. Likewise, previous studies have linked heat stress in sheep with a decrease in feed intake [40] and an increase in time spent lying/sleeping [41]. Water visitation has also been reported to affect the distance travelled, with an increase in distance travelled associated with an increase in watering events from one to two per day [42].…”

Section: Discussionmentioning

confidence: 85%

Sensor-Based Detection of Predator Influence on Livestock: A Case Study Exploring the Impacts of Wild Dogs (Canis familiaris) on Rangeland Sheep

Trotter

Manning

2022

Animals

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In Australia, wild dogs are one of the leading causes of sheep losses. A major problem with managing wild dogs in Australia’s rangeland environments is that sheep producers are often unaware of their presence until injuries or deaths are observed. One option for earlier detection of wild dogs is on-animal sensors, such as Global Positioning System (GPS) tracking collars, to detect changes in the behaviour of sheep due to the presence of wild dogs. The current study used spatio-temporal data, derived from GPS tracking collars, deployed on sheep from a single rangeland property to determine if there were differences in the behaviour of sheep when in the presence, or absence, of a wild dog. Results indicated that the presence of a wild dog influenced the daily behaviours of sheep by increasing the daily distance travelled. Differences in sheep diurnal activity were also observed during periods where a wild dog was present or absent on the property. These results highlight the potential for on-animal sensors to be used as a monitoring tool for sheep flocks directly impacted by wild dogs, although further work is needed to determine the applicability of these results to other sheep production regions of Australia.

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Section: Discussionmentioning

confidence: 85%

Sensor-Based Detection of Predator Influence on Livestock: A Case Study Exploring the Impacts of Wild Dogs (Canis familiaris) on Rangeland Sheep

Trotter

Manning

2022

Animals

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“…The increase in RR is one of the main physiological mechanisms used to dissipate internal heat, which is associated with vasodilation and promotes sweating and/or evapotranspiration in homeothermic organisms (Leite et al 2019). An accelerated and constant RR for several hours can interfere with the daily activities of the animal, as they attempt to dissipate the endogenous heat, which increases the energy spent (Lima et al 2019) and inhibits activities such as feeding and rumination, consequently decreasing the animal's performance (Machado et al 2020a).…”

Section: Discussionmentioning

confidence: 99%

Physiological responses, water consumption, and feeding behaviour of lamb breeds fed diets containing different proportions of concentrate

Pereira

Parente

Zanine

et al. 2022

JABB

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The use of adapted breeds, such as Santa Inês, is of paramount importance for regions with high temperatures because they develop efficient mechanisms for heat dissipation. Furthermore, some breeds have physiological adaptations, such as more efficient mechanisms for the digestion of fibrous foods (e.g. Rabo Largo), which can reduce the harmful effects of semiarid environments. We studied the ingestive behaviour, water consumption, and physiological parameters during feeding of two native sheep breeds fed diets containing high (700 g/kg DM; HC diet) or low (300 g/kg DM; LC diet) percentages of concentrates, based on dry matter (DM). A total of 40 uncastrated male lambs (20 Rabo Largo [breed 1] and 20 Santa Inês [breed 2], with an average body weight of 16.68 ± 2.78 kg, and 19.29 kg ± 3.28 kg, respectively), were distributed in a randomised block design in a two-by-two factorial scheme (breeds × diets) with 10 repetitions. Santa Inês lambs consumed and ruminated DM (P = 0.029 for both) and neutral detergent fibre (NDF; P = 0.001 and P = 0.004, respectively) more efficiently than RaboLargo lambs, while the latter showed an increase in respiratory rate (+19 breaths/min) and rectal temperature (+1.3 °C) compared to the Santa Inês lambs (P = 0.001). The HC diet negatively affected (P < 0.05) the feeding behaviour of the animals, reflecting the higher (P < 0.05) water consumption. The results showed that diets rich in concentrate negatively affected the thermoregulation of lambs. Santa Inês have greater feed and thermoregulatory efficiency than Rabo Largo lambs under conditions of heat stress in the feedlot.

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“…En la búsqueda de estrategias que ayuden a mantener la producción de alimentos de origen animal bajo este escenario climático adverso, algunos autores proponen la producción de ovinos como una alternativa (1,10,18) , principalmente debido a que son capaces de mantener su desempeño productivo bajo condiciones de EC (3) . Entre las características de adaptabilidad que poseen los ovinos se incluyen resistencia a parásitos, enfermedades y escasez de agua para consumo (15,19) ; también capacidad para aprovechar forrajes y esquilmos agrícolas de mala calidad, y el mantenimiento de la capacidad reproductiva del rebaño y el crecimiento de los corderos bajo escenarios de EC (1,3,5) . Cabe mencionar que el nivel de adaptación de los ovinos varía ampliamente entre razas, ya que existe una gran diversidad de ellas que fueron desarrolladas desde condiciones climáticas de frío hasta cálidas.…”

Section: Ovinos En Climas Cálidosunclassified

Termorregulación y respuestas reproductivas de carneros bajo estrés por calor. Revisión

Sierra¹,

Avendaño‐Reyes

Rivera

et al. 2021

Rev. Mex. Cienc. Pecu.

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Las temperaturas elevadas registradas durante la época de verano en las regiones cálidas comprometen la capacidad reproductiva de los animales domésticos. En carneros, el estrés por calor (EC) causa en el organismo una serie de ajustes fisiológicos, metabólicos, endocrinos y moleculares con el objeto de mantener normotermia y sobrevivir; sin embargo, varios de estos cambios se asocian negativamente con su fertilidad, principalmente los endocrinos. El EC en carneros provoca una disminución en las concentraciones sanguíneas de testosterona a través de diferentes mecanismos, y esto se refleja negativamente en el proceso de espermatogénesis y en la conducta sexual. En consecuencia, los carneros estresados por calor presentan baja calidad seminal y apetito sexual; a nivel de espermatozoides se ha observado daño estructural y en el ADN. Dada esta situación, se recomienda el uso de estrategias de mitigación del EC durante el verano en las explotaciones ovinas de regiones cálidas, tales como el uso de sombras en corrales, la administración de antioxidantes o modificaciones en la alimentación. Por lo tanto, el objetivo de este documento es revisar el conocimiento actual en relación al efecto del EC sobre la capacidad de termorregulación y reproductiva de los carneros, así como la aplicación de estrategias para su mitigación.

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Ethology, physiological, and ingestive responses of sheep subjected to different temperatures and salinity levels of water

Cited by 11 publications

References 17 publications

Sensor-Based Detection of Predator Influence on Livestock: A Case Study Exploring the Impacts of Wild Dogs (Canis familiaris) on Rangeland Sheep

Sensor-Based Detection of Predator Influence on Livestock: A Case Study Exploring the Impacts of Wild Dogs (Canis familiaris) on Rangeland Sheep

Physiological responses, water consumption, and feeding behaviour of lamb breeds fed diets containing different proportions of concentrate

Termorregulación y respuestas reproductivas de carneros bajo estrés por calor. Revisión

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