Neonatal lamb behaviour and thermoregulation with special reference to thyroid hormones and phosphorous element: Effect of birth weight and litter size

Darwish, Ragab A.; El-Bahr, Sabry M.

doi:10.21608/jvmr.2008.77858

Cited by 4 publications

(1 citation statement)

References 36 publications

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“…Regarding phenotypic factors, body weight, coat, and skin properties also influence the resistance to cold. Studies in species such as puppy dogs [ 40 , 41 ], buffalo calves [ 149 ], piglets [ 150 , 151 ], lambs [ 152 ], and dairy calves [ 153 ] have shown an association between birth weight and thermoregulatory capacity. In lambs, heavier newborns have a lower surface-to-volume ratio, which implies a lower tendency to lose heat, having higher energy reserves to thermoregulate [ 1 , 154 ].…”

Section: Intrinsic Factors Involved In the Generation Of Heat Through...mentioning

confidence: 99%

The Role of Brown Adipose Tissue and Energy Metabolism in Mammalian Thermoregulation during the Perinatal Period

Bienboire-Frosini

Wang

Marcet-Rius

et al. 2023

Animals

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Hypothermia is one of the most common causes of mortality in neonates, and it could be developed after birth because the uterus temperature is more elevated than the extrauterine temperature. Neonates use diverse mechanisms to thermoregulate, such as shivering and non-shivering thermogenesis. These strategies can be more efficient in some species, but not in others, i.e., altricials, which have the greatest difficulty with achieving thermoneutrality. In addition, there are anatomical and neurological differences in mammals, which may present different distributions and amounts of brown fat. This article aims to discuss the neuromodulation mechanisms of thermoregulation and the importance of brown fat in the thermogenesis of newborn mammals, emphasizing the analysis of the biochemical, physiological, and genetic factors that determine the distribution, amount, and efficiency of this energy resource in newborns of different species. It has been concluded that is vital to understand and minimize hypothermia causes in newborns, which is one of the main causes of mortality in neonates. This would be beneficial for both animals and producers.

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Section: Intrinsic Factors Involved In the Generation Of Heat Through...mentioning

confidence: 99%

The Role of Brown Adipose Tissue and Energy Metabolism in Mammalian Thermoregulation during the Perinatal Period

Bienboire-Frosini

Wang

Marcet-Rius

et al. 2023

Animals

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Including magnesium sulfate in the diet of twin-bearing ewes in the last week of gestation improves the adaptation of lambs to extrauterine life

Minteguiaga,

López Mazz,

Fierro

et al. 2024

Anim. Prod. Sci.

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Context Most deaths of lambs in the first days of life are due to failure to adapt to extrauterine life. Aims This study aimed to test the hypothesis that adding magnesium sulfate (MgSO4) to the diet of twin-bearing ewes in the last week of gestation improves the adaptation to the extrauterine life of the lambs. Methods Eighty-three multiparous Finnish × Polwarth ewes carrying twins in the last week of gestation were MgSO4 supplemented (n = 40) or allocated to control (n = 43). We recorded the durations of gestation, expulsion and lambing, interlambing interval, and birthweights, meconium score, lamb rectal temperature (at birth and 3 h after birth), whether assistance was needed (yes or no) and time from lamb expulsion to stand and to suck (n = 148). A jugular blood sample of the lambs was analysed for acidity, partial pressures of CO2 and oxygen; active and standard HCO3, blood base excess (BE b) and extracellular fluid base excess (BE ecf), saturated oxygen, and total CO2 concentration. Glucose was analysed with a portable device. Key results Gestation was longer in supplemented ewes (147.7 ± 2.0 vs control: 146.7 ± 1.7 days, P < 0.05). Birthweight and litter birthweight of lambs were higher when ewes were supplemented (3.74 ± 0.6 and 7.47 ± 0.9 kg vs control: 3.51 ± 0.5 and 7.02 ± 0.9 kg, P < 0.05). The need for assistance, meconium score, durations of expulsion and lambing, and time to stand and to suck were not different between treatments (P > 0.05). The interlambing interval was shorter in the supplemented ewes (6.7 ± 2.7 m vs control: 10.4 ± 2.6, P < 0.05). Lamb rectal temperature was not different between treatments 3 h after birth, but at birth was lower in lambs of supplemented ewes (P < 0.05). Treatments did not differ in blood acidity, CO2 partial pressure and total concentration, active and standard HCO3, both measures of base excess, nor blood glucose. Lambs of supplemented ewes had higher oxygen saturation and partial pressure (P < 0.05). Conclusions The MgSO4 supplementation improves the adaptation to extrauterine life in pen conditions. Implications It should be tested whether maternal supplementation with MgSO4 reduces the mortality of twin lambs.

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The Impacts of Waterproof Insulated Jackets on Lamb Performance on a UK Lowland Farm

Collins

Blackie

2021

Animals

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The majority of lamb losses occur within the first two weeks of life, with cold stress being a major cause of lamb morbidity and mortality. This study investigated the effect of insulating lamb jackets on newborn lambs. One hundred and four newborn lambs were randomly allocated by birth date to two treatment groups, (a) non-jacketed (n = 52) or (b) jacketed (n = 52), for fourteen days after birth. The live weights of lambs were recorded regularly up to 21 days, and average daily weight gains were calculated from these data. For the first two days after recruitment to the study, surface and body temperatures of lambs were also recorded. The jackets significantly increased the lambs’ surface temperatures, providing a warmer microclimate and reduced cold stress for jacketed lambs. There was no significant effect of the insulating jackets on estimated body temperatures, live weights or average daily weight gain of the lambs in this study. There were no detrimental effects of the jackets, and no rejection of lambs occurred.

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Neonatal lamb behaviour and thermoregulation with special reference to thyroid hormones and phosphorous element: Effect of birth weight and litter size

Cited by 4 publications

References 36 publications

The Role of Brown Adipose Tissue and Energy Metabolism in Mammalian Thermoregulation during the Perinatal Period

The Role of Brown Adipose Tissue and Energy Metabolism in Mammalian Thermoregulation during the Perinatal Period

Including magnesium sulfate in the diet of twin-bearing ewes in the last week of gestation improves the adaptation of lambs to extrauterine life

The Impacts of Waterproof Insulated Jackets on Lamb Performance on a UK Lowland Farm

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