203 Genetic parameter estimation for foot structure in American Angus cattle

Wang, L.; Miller, Stephen; Retallick, K.; Moser, Daniel W.

doi:10.2527/asasann.2017.203

Cited by 8 publications

(13 citation statements)

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“…The callipyge gene in sheep has been reported to cause a similar double-muscled phenotype in sheep to that seen in beef cattle; however, a study done by Jackson et al (1997) indicated that none of the adverse effects associated with double muscling in beef cattle are seen in callipyge sheep. A decrease in terms of meat tenderness have however been reported (Webb and Casey, 2010).…”

Section: Unintended Outcomes Of Selectionmentioning

confidence: 98%

“…The first definitions of animal welfare referred to the complete mental and physical health of the animal in harmony with its environment as well as free from suffering (Hughes, 1976;Carpenter, 1980). More recent definitions state that the welfare of any sentient farmed animal, or animal used in the service of human beings, should be defined by the animal's individual perception of its own physical and emotional state (Webster, 2013). The majority of these all refer to physical health, environment and the emotional and psychological state of the animal (Koknaroglu and Akunal, 2013).…”

Section: Defining Welfare In Livestockmentioning

confidence: 99%

“…Heritability estimates for claw traits remain low due to large environmental variances, and improved objective measurements are required for genetic evaluations. In a study on Angus cattle in the US, heritability estimates varied from 0.16 to 0.37 for different claw traits (Wang et al, 2017). In a South African study on Bonsmara cattle, the morphological and physiological characteristics of claws were studied, indicating that tensile strength was influenced by bioregion.…”

Section: Unintended Outcomes Of Selectionmentioning

confidence: 99%

“…Beef and sheep are raised mostly in extensive farming systems with breeding objectives biased towards growth traits. Webb and Casey (2010) have reviewed the consequences of prolonged selection for growth and growth efficiency on meat quality in detail. Selection emphasis on increased muscularity and meat yield in beef cattle has inadvertently led to conditions such as double muscling with adverse effects on fertility (Fiems, 2012;Fiems and Ampe, 2014).…”

Section: Unintended Outcomes Of Selectionmentioning

confidence: 99%

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Unintended consequences of selection for increased production on the health and welfare of livestock

Marle-Köster

Visser

2021

Arch. Anim. Breed.

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Abstract. Modern farming technologies, including quantitative selection and breeding methods in farm animal species, resulted in increased production and efficiency. Selection for increased output in both intensive and extensive production systems has trade-offs and negative outcomes, often more pronounced in intensive systems. Animal welfare and health are often adversely affected and this influences sustainable production. The relative importance of animal welfare differs among developed and developing countries due to the level of economic development, food security and education, as well as religious and cultural practices which presents challenges for sound scientific research. Due to breeding goals in the past set on growth performance, traits such as fertility, welfare and health have been neglected. Fertility is the single most important trait in all livestock species. Reduced fertility and lameness, claw health and mastitis results in unnecessary culling and reduced longevity. Selection pressure for growth accompanied with inbreeding has resulted in a number of genetic defects in beef, sheep and pigs. This review demonstrated the importance of inclusion of animal welfare concepts into breeding objectives and selection strategies. Accurate phenotyping of welfare traits is a limiting factor in the implementation of mitigating strategies, which include diagnostic testing, control of inbreeding and genomic selection.

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Section: Unintended Outcomes Of Selectionmentioning

confidence: 98%

Section: Defining Welfare In Livestockmentioning

confidence: 99%

Section: Unintended Outcomes Of Selectionmentioning

confidence: 99%

Section: Unintended Outcomes Of Selectionmentioning

confidence: 99%

See 2 more Smart Citations

Unintended consequences of selection for increased production on the health and welfare of livestock

Marle-Köster

Visser

2021

Arch. Anim. Breed.

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“…Heritability estimates for dairy cattle have varied from 0.01 to 0.14 and 0.06 to from 0.39 when estimated with linear and threshold models, respectively (Heringstad et al, 2018). Foot angle and claw set have also been studied with a scoring system in American Angus cattle, in which heritability estimates varied from 0.16 to 0.37 (Wang et al, 2017). However, morphological and physiological characteristics of beef cattle claws have not been reported for beef cattle in South Africa.…”

Section: Introductionmentioning

confidence: 99%

Morphological and physiological characteristics of claw quality in South African Bonsmara cattle

2019

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Sound claws are essential for beef cattle, given the marked influence they have on functional longevity and subsequent performance. The aim of this study was to evaluate morphological and physiological claw characteristics of Bonsmara SA beef cattle in the major bioregions of South Africa. Normal claws of 89 Bonsmara stud animals were collected from three bioregions in which Bonsmara cattle are farmed, namely Mesic Highveld Grassland, Eastern Kalahari Bushveld and Central Bushveld bioregions. Most of these claws were from Bonsmara bulls that were slaughtered after completion of a standardized intensive feeding test and a few were from older cows. Lateral toe length (LL), medial toe length (ML), claw circumference, colour coding and tensile strength (TS) were determined on the fore and hind claws and mineral composition only on the fore claws. Multifactorial analysis of variance (ANOVA) models indicated that bioregion, moisture content, calcium (Ca), selenium (Se) and claw position (fore versus hind claws) had a significant effect (P <0.05) on TS. It is clear that environmental factors need to be considered in the evaluation of claw quality. This research serves as a benchmark for claw traits in the Bonsmara breed. Recording of claw and conformation traits is essential for genetic improvement.

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