International Journal of Agriculture Extension and Social Development

author(s)
Garima Choudhary, U Pannu and GC Gahlot

abstract
This research was aimed to investigate the reproduction traits and their genetic parameters of Tharparkar cattle under local agroclimatic conditions of northwestern region of India. Heritability, phenotypic, and genetic parameters were estimated for reproductive traits of first parity. This study revealed the averages AFC, FSP and FCI were 1510.88±22.29 days, 149.66±5.15 days and 423.60±6.23 days respectively. The heritability estimates for reproductive traits of the first lactation were 0.52±0.070, 0.12±0.166 and 0.18±0.232, respectively. Age at first calving had positive genetic correlation with first service period. The genetic correlation of AFC with FCI was very high (0.74), Negative and significant. The genetic correlations of FSP with FCI was positive, high and significant. Phenotypic correlation of all reproductive traits was positive. The heritability estimates of AFC was medium which revealed that this trait had more additive genetic variance which might be utilized by individual selection and it could be achieved owing to sire selection. First service period and first calving interval largely controlled by factors other than additive gene action, which might be non-additive gene action and environmental factors. Hence, better feeding and management practices seem conductive for ameliorating this trait.