Metabolic response to water shortage in an isolated feral sheep population

Prado, Ornar R.; Arias, Erika I.; Carrillo, María D.; Hernández, Juan Ramón Hernández; García, Arturo C.

doi:10.4067/s0719-81322021000200091

Cited by 2 publications

(2 citation statements)

References 23 publications

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“…Recent studies have analyzed the morphology (Hernandez et al, 2017) and physiology of Socorro Island Merino sheep (Arias et al, 2020;Prado et al, 2021). However, the growth characteristics and factors that affect this breed have not yet been determined.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Growth of Socorro Island Merino Lambs

Castillo

Macedo

Arredondo

et al. 2022

Chil. j. agric. anim. sci.

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The aims of this study were to evaluate the effect of genetic and non-genetic factors on the growth of Socorro Island Merino lambs and to model their growth curve using nonlinear mathematical models. The weight of 41 Socorro Island Merino lambs was recorded at birth and at 45, 90, 135, 180, 225, 270, 315 and 365 days of life from May 2019 to September 2021. The effects on growth of sex, genotype, year of birth, and parity of the dam were analyzed. Four non-linear models (Brody, Logistic, Gompertz and von Bertalanffy) were fitted for determining the best model to describe growth curve. Birth weight and pre-weaning growth rate were not affected (P 0.05) by any of the factors studied, while weaning weight was only significantly affected (P 0.05) by sex. Year of birth significantly affected (P 0.05) post-weaning growth rate and weight of the lamb from 270 days, while sex significantly affected (P 0.05) weight at 315 days. The Gompertz and Brody models were the best fitted to describe growth curves of lambs. Purebred males showed a larger response to increasing levels of energy-protein supplementation, while they had greater mature weight and lower maturation rate compared to females and crossbred males. In conclusion, knowledge of growth and factors influencing growth pattern can help implement appropriate management strategies and make decisions aimed at the conservation of Socorro Island Merino lambs.

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Section: Introductionmentioning

confidence: 99%

Characterization of Growth of Socorro Island Merino Lambs

Castillo

Macedo

Arredondo

et al. 2022

Chil. j. agric. anim. sci.

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“…En la actualidad, la población de esta especie se reduce a menos de un centenar de individuos, descendientes de un hato de 50 animales extraído de la isla por investigadores de la Facultad de Medicina Veterinaria y Zootecnia de la Universidad de Colima en años previos a su erradicación, por lo que se encuentra en inminente riesgo de extinción. Diversos estudios han permitido conocer aspectos relevantes sobre su morfología (Perezgrovas et al, 2011;Hernández et al, 2017), su fisiología (Arias et al, 2020;Prado et al, 2021) y su crecimiento (Macedo et al, 2018). Sin embargo, no se han realizado estudios sobre las causas y factores que afectan su mortalidad que coadyuven a incrementar su número, lo cual se vuelve imprescindible considerando su estatus de riesgo.…”

Section: Introductionunclassified

Una Nota Sobre La Mortalidad De Corderos Merino Isla Socorro

Macedo

Maldonado

Arredondo

et al. 2022

Trop Subtrop Agroecosyst

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Background. The Socorro Island Merino sheep constitutes a unique population in the world whose number is reduced to less than a hundred individuals, thus facing an imminent risk of extinction. Objective. The objective of this study was to analyze the causes and risk factors associated with the mortality of Socorro Island Merino lambs. Methodology. The rate and causes of mortality were determined and the association between mortality and weight, year of birth, sex, genotype of the lamb and the number of lambing of the ewe was determined by Chi-square test. Subsequently, a logistic regression analysis was performed using only those variables significantly associated with mortality. Results. Mortality rate was 29.31%. The 70.59% of deaths occurred during the first 48 hours after lambing being starvation the main cause of death. Mortality was associated (P<0.05) with the lambs’ year birth and the number of lambing of the ewe, while birth weight, sex and genotype were not related (P>0.05) with death of the lambs. According to the logistic regression analysis, lambs born in 2020 and born to a multiparous ewe had an 83 and 74% lower risk of death than those born in 2019 and to a primiparous ewe, respectively. Implications. The use of professionally qualified personnel and the establishment of good zootechnical management practices significantly reduces lamb mortality. Conclusions. Starvation represented the main cause of death, while the year of birth of the lamb and the number of lambing of the ewe were the risk factors associated with mortality.

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Metabolic response to water shortage in an isolated feral sheep population

Cited by 2 publications

References 23 publications

Characterization of Growth of Socorro Island Merino Lambs

Characterization of Growth of Socorro Island Merino Lambs

Una Nota Sobre La Mortalidad De Corderos Merino Isla Socorro

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