Estimation of Genetic and Phonotypic Trends for Age at First Calving, Calving Interval, Days Open and Number of Insemination to conception for Isfahan Holstein Cows

سال انتشار: 1393
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 483

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شناسه ملی سند علمی:

JR_IJABBR-2-5_002

تاریخ نمایه سازی: 26 اسفند 1394

چکیده مقاله:

For the current research the records of 62 farms in Isfahan province were available. To estimate genetic and phonotypic trends of reproductive traits such as age at first calving, calving interval, days open and number of insemination to conception rate the records of 63,866 cows including 167793 reproductiverecords were employed. Farms were covered by Vahdat industrial Agriculturists and Dairymen Cooperative of Isfahan during 1986 to 2012. Genetic parameters estimated by linear animal model using Restricted Maximum Likelihood Method (REML). Genetic and phonotype trends were estimated byusing regression of average breeding values and phonotype values on calving year. Heritability of age at first calving (0.19±0.007), calving interval (0.06±0.005), days open (0.041±0.004) and number of insemination to conception (0.071±0.004) were estimated. Phonotypic trends of age at first calving,calving interval, days open, number of insemination to conception in first parity and number ofinsemination to conception in second parity onward were estimated to be -3.48± 1.08, -0.41±0.4, -0.42±0.2, 0.013±0.0025 and 0.031±0.01 respectively. Estimated genetic trends for age at first calving,calving interval, days open, for number of insemination to conception in first parity and number of insemination to conception in second parity onward were estimated to be 0.07±0.06, -0.56±0.5, - 0.02±0.06, 0.0015±0.001 and 0.0005±0.005, respectively.

کلیدواژه ها:

phenotype and genetic trends ، age in first calving ، days open ، calving interval ، number of insemination to conception

نویسندگان

Samaneh Solemani-Baghshah

Department of Animal Science, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran.

Saeid Ansari-Mahyari

Department of Animal Science, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran.

Mohamad-Ali Edriss

Department of Animal Science, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran.

Hojjat Asadollahpour Nanaei

Department of Animal Science, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran.