A study of growth and carcass traits in dehorned and polled composite bulls

Goonewardene, L. A.; Price, M. A.; Liu, M. F.; Berg, R. T.; Erichsen, Christine Margaret.

doi:10.4141/a98-121

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…These findings were recently confirmed by own evaluations based on the database from the German national genetic evaluation for Holstein AI sires [ 26 ]. Quite similar results were reported for dual-purpose German Simmental cattle, while no differences between polled and horned groups were found with regard to health, growth and reproductive traits in beef cattle [ 10 , 27 – 29 ]. Evidence accumulated for polled German Simmental cattle, as well as more recent advances in the Holstein breed, further indicate that the initial inferior performance of polled individuals might be due to a selection advantage of their horned pendants rather than an inevitable genetic disadvantage [ 22 , 30 ].…”

Section: Introductionsupporting

confidence: 76%

“…Hence, the urgent need for alternatives to cattle dehorning is strengthened. Simply avoiding dehorning by keeping naturally-horned cattle is considered as one possibility [ 8 ], but implies substantial adaptation of housing conditions and does not contribute to reduce the risk of injuries among cattle and animal keepers [ 9 , 10 ]. In this regard, targeted selection and dissemination of genetically-polled animals into naturally-horned cattle breeds (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of breeding strategies for polledness in dairy cattle using a newly developed simulation framework for quantitative and Mendelian traits

et al. 2016

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BackgroundIntensified selection of polled individuals has recently gained importance in predominantly horned dairy cattle breeds as an alternative to routine dehorning. The status quo of the current polled breeding pool of genetically-closely related artificial insemination sires with lower breeding values for performance traits raises questions regarding the effects of intensified selection based on this founder pool.MethodsWe developed a stochastic simulation framework that combines the stochastic simulation software QMSim and a self-designed R program named QUALsim that acts as an external extension. Two traits were simulated in a dairy cattle population for 25 generations: one quantitative (QMSim) and one qualitative trait with Mendelian inheritance (i.e. polledness, QUALsim). The assignment scheme for qualitative trait genotypes initiated realistic initial breeding situations regarding allele frequencies, true breeding values for the quantitative trait and genetic relatedness. Intensified selection for polled cattle was achieved using an approach that weights estimated breeding values in the animal best linear unbiased prediction model for the quantitative trait depending on genotypes or phenotypes for the polled trait with a user-defined weighting factor.ResultsSelection response for the polled trait was highest in the selection scheme based on genotypes. Selection based on phenotypes led to significantly lower allele frequencies for polled. The male selection path played a significantly greater role for a fast dissemination of polled alleles compared to female selection strategies. Fixation of the polled allele implies selection based on polled genotypes among males. In comparison to a base breeding scenario that does not take polledness into account, intensive selection for polled substantially reduced genetic gain for this quantitative trait after 25 generations. Reducing selection intensity for polled males while maintaining strong selection intensity among females, simultaneously decreased losses in genetic gain and achieved a final allele frequency of 0.93 for polled.ConclusionsA fast transition to a completely polled population through intensified selection for polled was in contradiction to the preservation of high genetic gain for the quantitative trait. Selection on male polled genotypes with moderate weighting, and selection on female polled phenotypes with high weighting, could be a suitable compromise regarding all important breeding aspects.Electronic supplementary materialThe online version of this article (doi:10.1186/s12711-016-0228-7) contains supplementary material, which is available to authorized users.

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Section: Introductionsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Evaluation of breeding strategies for polledness in dairy cattle using a newly developed simulation framework for quantitative and Mendelian traits

et al. 2016

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“…However, it was observed that as the accuracy of EBVs increased to 70%, many of the significance differences were not sustained. The results are consistent with previous research on the impact of polledness on beef productivity of different breeds of cattle [ 5 , 14 , 16 , 29 ].…”

Section: Discussionsupporting

confidence: 92%

“…Genetic effects due to inbreeding have been noticed in dairy cattle because of a few polled elite bulls used through artificial insemination [ 12 , 13 ]. On the other hand, perceptions about the undesirable effects of polledness on beef production have been largely annulled by comparing different traits of growth, carcass yield, and meat quality in a few beef breeds and cross-bred herds [ 5 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Genetic Merit for Weight and Meat Traits between the Polled and Horned Cattle in Multiple Beef Breeds

Randhawa

McGowan

Porto-Neto

et al. 2021

Animals

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Breeding for polled animals is deemed the most practical solution to eradicate horns naturally and circumvent management costs and risks on health and welfare. However, there has been a historical reluctance by some farmers to select polled animals due to perceived lower productivity of their calves. This study has compared estimated breeding values (EBVs) between horned and polled animals (N = 2,466,785) for 12 production and carcass traits to assess historical (before 2000) and recent (2000–2018) genetic implications of poll breeding. Older generations of the polled animals in most breeds had significantly lower (Bonferroni-corrected p = 0.05) genetic merits for live (birth to maturity) and carcass weights, milk, meat quality, and fat content traits. Substantial gains of genetic potential were achieved during 2000 to 2018 in each breed, such that polled animals have significantly improved for the majority of traits studied. Generally, polled cohorts showed advantageous EBVs for live and carcass weights irrespective of the lower birth weights in some breeds. While Polled Brahman showed inferior production parameters, the poll genetics’ effect size (d) and correlation (r) were very small on recent birth weight (d = −0.30, r = −0.08), 200 days (−0.19, −0.05), 400 days (−0.06, −0.02), 600 days (−0.05, −0.01), mature cow live weight (−0.08, −0.02), and carcass weight (−0.19, −0.05). In conclusion, although there is some evidence that historical selection for polled breeding animals may have reduced productivity, there is strong evidence that more recent selection for polled genotypes in the breeds studied has not resulted in any adverse effects on genetic merit.

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“…Keunggulan dari sifat tanpa tanduk, yakni generasi homozigot pada sapi tanpa tanduk mengurangi biaya dan waktu untuk pemotongan tanduk dan menghilangkan stres pada ternak (Medugorac et al, 2012;Prayaga 2007;Zulkharnain et al, 2017). Beberapa keunggulan lain pada sapi tanpa tanduk dari segi manajemen pemeliharaan, seperti mengurangi resiko terluka yang sering terjadi pada ternak yang disebabkan oleh tanduk, dapat mencegah memar dan kerusakan pada kulit (Goonewardene et al, 1999). Seleksi terhadap sapi tanpa tanduk sangat penting terutama pada manajemen budidaya ternak modern (Zulkharnaim et al, 2020).…”

Section: Pendahuluanunclassified

Morphometric Characteristics of Polled Bali Cattle Calves as New Local Beef Cattle in Indonesia

Zulkharnaim,

Baba,

Rahim

et al. 2024

JIPT

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This study aimed to determine the morphometric performance of polled Bali cattle aged 12-15 months and the influence of the cows on the morphometrics of breeding cattle.The research material consisted of 120 head Bali cattle divided into 40 head polled cattle, 40 head with horns, and 40 cows with horns. The study was conducted in Barru District, South Sulawesi Province. The study parameters consisted of withers height, body length, and heart girth. The data were statistically analyzed using the independent sample t-test, and the effect of the morphometrics of the cows on the calves was analyzed using simple regression analysis. Measurement data were analyzed using the IBM SPSS Statistics application. The results showed a very significant difference in the body length of polled and horned males (p<0.01). Significant differences were also found in withers height and body length between polled and horned female calves (p<0.01). Polled Bali cattle aged 12-15 months have a larger morphometric size than those with horns. It is hoped that identifying the superiority of polled Bali cattle will continue at different age statuses to compile information as material for the Indonesian National Standard for hornless Bali cattle.

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A study of growth and carcass traits in dehorned and polled composite bulls

Cited by 9 publications

References 5 publications

Evaluation of breeding strategies for polledness in dairy cattle using a newly developed simulation framework for quantitative and Mendelian traits

Evaluation of breeding strategies for polledness in dairy cattle using a newly developed simulation framework for quantitative and Mendelian traits

Comparison of Genetic Merit for Weight and Meat Traits between the Polled and Horned Cattle in Multiple Beef Breeds

Morphometric Characteristics of Polled Bali Cattle Calves as New Local Beef Cattle in Indonesia

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