Evaluating fertility and growth rate potential of indigenous sheep breeds submitted  to heat stress under different management systems

Khan, Sami Ullah; Khan, Imdad Ullah; Khan, Alam Zeb; Zaman, Shahid; Majid, Abdul; Rehman, Atiq Ur; Khan, Mumtaz Ali; Maris, Hamza; Ullah, Rahman; Qureshi, Subhan

doi:10.5455/javar.2020.g407

Cited by 2 publications

(2 citation statements)

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“…Low-input farming systems operate in-between conventional and organic systems, trying on the one hand to minimize the use of external resources and on the other hand to optimize their cost. In this farming system a wide range of local breeds is used worldwide (Marković et al 2019;Khan et al 2020;Haile et al 2020). The preference for local breeds is mainly due to their higher adaptability to the particular climate and to the type of vegetation found in the area, which can be used as their food (Gaughan et al 2019;Perucho et al 2019) and to their increased resistance to diseases (Dudu et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Grazing behaviour, intake, digestion, performance and endoparasitic infection of lambs raised at different stocking rates under low-input farming systems

Kantzoura¹,

Hadjigeorgiou

Goulas³

et al. 2022

J Hellenic Vet Med Soc

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Twenty-four Boutsiko breed lambs were allocated to three groups of equal average live weight (LW: 20.8 kg) and pastured at three stocking rates: SR1, SR2 and SR3 (representing 60, 80 and 100 lambs/ha respectively) under low-input farming practices. Animals were grazed on a semi natural sward daily, during a 60 days period. Sward height in all treatments remained above 7 cm during the trial and the herbage gross chemical composition was similar between treatments. On average, the lambs grazed 372 min, ruminated 140 min and spent 88 min on other non-feeding activities during the daily pasturing. Lambs consumed at the start and the finish of the trial 714 g and 1014 g of herbage DM/day, or 70.5 and 99.0 g/kgW0.75/day respectively. Herbage DM digestibility (in vivo) was moderate averaging 61% and no differences were observed between the three groups of lambs. The daily live weight gain of lambs (DLWG) was different (p<0.01) between the stocking rates, where lambs on plot SR1 had the highest gain (0.0918 kg LW/day) and lambs on SR2 and SR3 plots the lowest gain (0.0344 and 0.0531 kg LW/day respectively). Faecal egg counts (FEC) for gastrointestinal parasites (GIN) from lambs grazing plot SR3 were low, while high numbers of Moniezia spp. eggs were present in faecal samples of all groups of lambs at the end of the experiment. It is concluded that lamb fattening on pasture can be achieved at reasonable stocking rates, without the use of anthelmintics, if a local hardy breed is used.

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Section: Introductionmentioning

confidence: 99%

Grazing behaviour, intake, digestion, performance and endoparasitic infection of lambs raised at different stocking rates under low-input farming systems

Kantzoura¹,

Hadjigeorgiou

Goulas³

et al. 2022

J Hellenic Vet Med Soc

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“…Although farm animals have natural mechanisms of adaptation and thermoregulation against exposure to heat stress, frequent exposure and fluctuating climate conditions can affect livestock productivity (Thronton et al, 2021). Sheep in areas with tropical climates are more likely to have significant heat stress effects compared to those in areas with cold climates, even when the same management system is applied (Khan et al, 2020). Tropical farm animals as susceptible to severe heat stress due to extreme environmental temperatures, which is aggravated by high relative humidity, which reduce evaporative cooling and prevents heat loss from the body.…”

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confidence: 99%

Influence of Management Systems on Severity of Heat Stress and Reproductive Performance of Rams in the Tropics – A Review

Mazlishah,

Fauzi,

Nor

et al. 2024

Annals of Animal Science

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Sheep are an important source of protein for humans, and recent decades have seen a significant increase in the production of sheep-based products, thus indicating an increase in demand for this commodity. At a time when this sector is growing, sheep are exposed to various challenges. These include climate change, which can cause heat stress in sheep, including rams, which later negatively affects their growth and reproductive performance. Exposure to heat stress results in physiological and reproductive behaviour responses in rams, which could also be used to visually identify the effect of heat stress as it will affect the productivity of livestock. In addition, the year-round hot and humid climate of the tropics is expected to contribute to a higher probability of heat stress occurrences in rams reared in developing countries around the equator. Nevertheless, the adaptability of rams to heat stress varies according to their origin, whereby native breeds tend to adapt better. Despite that, native breeds still can be affected by adverse environmental conditions and rely on thermoregulation mechanisms to mitigate heat stress. This results in numerous negative physiological changes, such as sweating and increased heart rate. This review highlights the effects of heat stress on the physiology, reproductive behaviour and reproductive performance of male sheep. The review also discusses the impact of management systems on heat stress in rams, which affects sheep productivity.

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Evaluating fertility and growth rate potential of indigenous sheep breeds submitted to heat stress under different management systems

Cited by 2 publications

References 5 publications

Grazing behaviour, intake, digestion, performance and endoparasitic infection of lambs raised at different stocking rates under low-input farming systems

Grazing behaviour, intake, digestion, performance and endoparasitic infection of lambs raised at different stocking rates under low-input farming systems

Influence of Management Systems on Severity of Heat Stress and Reproductive Performance of Rams in the Tropics – A Review

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