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Rahbar, R., Abdullahpour, R., Sadeghi-Sefidmazgi, A. (2024). The Effect of Holstein Sire Predicted Transmitting Ability on the Performance of Their Daughters in Isfahan Herds. , 16(1), 125-139. doi: 10.22067/ijasr.2023.82164.1139
Rabie Rahbar; Rohullah Abdullahpour; Ali Sadeghi-Sefidmazgi. "The Effect of Holstein Sire Predicted Transmitting Ability on the Performance of Their Daughters in Isfahan Herds". , 16, 1, 2024, 125-139. doi: 10.22067/ijasr.2023.82164.1139
Rahbar, R., Abdullahpour, R., Sadeghi-Sefidmazgi, A. (2024). 'The Effect of Holstein Sire Predicted Transmitting Ability on the Performance of Their Daughters in Isfahan Herds', , 16(1), pp. 125-139. doi: 10.22067/ijasr.2023.82164.1139
Rahbar, R., Abdullahpour, R., Sadeghi-Sefidmazgi, A. The Effect of Holstein Sire Predicted Transmitting Ability on the Performance of Their Daughters in Isfahan Herds. , 2024; 16(1): 125-139. doi: 10.22067/ijasr.2023.82164.1139

The Effect of Holstein Sire Predicted Transmitting Ability on the Performance of Their Daughters in Isfahan Herds

پژوهشهای علوم دامی ایران
Article 9, Volume 16, Issue 1 - Serial Number 57, March 2024, Pages 125-139    PDF (1.04 M)
Document Type: Research Articles
DOI: 10.22067/ijasr.2023.82164.1139
Authors
Rabie Rahbar* 1; Rohullah Abdullahpour2; Ali Sadeghi-Sefidmazgi3
1Department of Agriculture, Payame Noor University (PNU), Tehran, Iran
2Department of Animal Science, Islamic Azad University, Qaemshahr Branch, Mazandaran, Iran.
3Department of Animal Science, College of Agriculture ‎and Natural Resources, University of Tehran, Karaj, Iran.
Abstract
Introduction: one of the most important and practical tools in increasing the production and profit of dairy cattle herds is to determine the exact aims of breeding, suitable genetic selection and breeding of premium cows. Based on animal breeding, breeders should make sure that the difference in the genetic merit of one or several traits leads to the difference in the phenotypic performance of the animal. Therefore, they want to reliably identify and select superior sires within and between breeds. Considering the importance of bulls in dairy herds and the use of their semen on a very wide level, this study aims to compare the information of genetic-economic indicators and productive, reproductive and health traits in the semen catalog of bulls with the actual performance of their daughters in Isfahan herds.
Materials and Methods: In this research, the information of 16 Holstein dairy herds located in Isfahan province during the years 2002 to 2017, was used. The number of productive livestock in the target herds was between 1000 and 5000 heads. Finally, 18,559 cows from the first to the fifth period of lactation, obtained from artificial insemination, which had known sires, were used. The genetic evaluation information of each sire that was used includes predicted transmitting ability (PTA), genetic-economic indicators: lifetime net merit (LNM$) and lifetime fluid merit (LFM$), production traits: milk, fat, protein, reproductive traits: sire conception rate (SCR), daughter pregnancy rate (DPR), daughter calving ease (DCE), daughter stillbirth (DSB) and health traits: production life (PL), somatic cell score (SCS), resistance to mastitis disease (Mas), metritis (Met) and retained placenta (RP) was based on the official evaluation of August 2019 by the USA council on dairy cattle breeding. Mixed and generalized linear models were used to assess the relationship between sire's PTA and daughters’ record. Sire's PTA were milk, fat, protein, daughter pregnancy rate, production life, somatic cell score, daughter calving ease, daughter stillbirth and lifetime net merit and lifetime fluid merit indices. Daughter records were milk-305, fat-305 and protein-305, open days, calving interval, age of first calving, number of productive days, calf birth weight, somatic cell score, number of inseminations per pregnancy, history of dystocia, stillbirth, metritis, retained placenta and mastitis traits. In this study, the analysis of data was done using R software and lme4 and lmerTest software packages.
Results and Discussion: Based on the results, PTA milk and SCR of most of the bulls used in herds were average, while they were lower values for LNM$ and LFM$ indices and PTA, Fat, Pro and PL traits and higher values for SCS and DSB traits. Correlation between indices and PTA of different traits of sires showed that the highest correlation was between LNM$ and LFM$ indices and the lowest was between SCR and DSB, Milk and SCR and RP and SCR traits. The correlation between sires' PTA and their daughters' performance in productive, reproductive and health traits showed that the correlation level was in the range between -0.19 and 0.16. Also, the regression coefficients of productive, reproductive and health traits of daughters were estimated based on the PTA of their sires in the studied herds, which ranged from -32.273 (between the PTA of daughter calving ease and milk-305) and 3.679 (between PTA fat and milk-305). The estimation of the odds ratio of some traits from sires' PTA on the daughters' health and reproductive (classifiable) traits showed that values were close to one for mastitis resistance, daughters' pregnancy rate and production life traits from sires' PTA which indicates the low effects of sires' PTA on their daughters' performance. However, the estimation of the odds ratio of PTA sires, related to metritis disease resistance, somatic cell score, resistance to retained placental and daughters calving ease traits had inverse relationship with the metritis and retained placental diseases (0.85, 0.67 and 0.74) and direct relationship with dystocia (1.23), respectively. The transmitting ability of sires is predicted based on the performance of their daughters in dairy cattle breeding farms, the data of those farms were available to the semen production company, the difference between conditions such as climate and breeding management of the mentioned herds and the herds of this study, can be affected the interaction of genotype and environment.
Conclusion: In this study, the correlation coefficients between random variables of sires' PTA for productive traits (milk, fat and protein) with their daughters' performance were calculated to be higher compared to reproductive and health traits. Also, the rate of OR of resistance to metritis and RP diseases, SCS and DCE, showed the effects of sires' PTA on the performance of their daughters. Therefore, according to the results, it is possible to take more advantage from sires predicted transmitting ability for milk, fat, protein, DPR and SCS in proper selection of semen and improving the phenotypic performance of daughters. While available information in genetic evaluations of other traits were less reliable, probably due to low heritability or high genetic by environment interactions.
Keywords
Semen; Genetic merit; Dairy cow; Daughters’ performance
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