Reproductive Profile of Crossbred Cows For Augmenting Productivity
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Date
2001
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Birsa Agricultural University, Ranchi
Abstract
The present study was carried out at Military Dairy Farm, Namkom, Ranchi. The available reproductive data of 241 animals and 791 calvings since 1987 to 2000 were scanned and various observations were recorded. The important findings have been summarized as follows:
i) The overall conception rates of the herd was found to vary between 45.74 and 51.89 per cent. The overall services required per conception was recorded to be 1.98, the overall mean service period was 97.2 days.
11)Among the infertility problems in the herd, the overall incidence of anestrus was 52.27 per cent, endometritis, 5.01 per cent, cystic ovarian degeneration, 2.27 per cent and repeat breeding, 32.27 per cent.
iii) Among the different periparturient disorders, the incidence of retention of fetal membrane, abortion, premature birth, still birth and dystocia was recorded to be 8.03 per cent, 6.06 per cent, 4.09 per cent, 0.9 per cent and 0.35 per cent respectively. The overall periparturient disorder percentage in the herd was 19.24 per cent.
iv) The conception rate with 1st AI was 46.66 per cent.
v) The average values of age at first heat and age of first fertile oestrus of herd was 696.04 ± 8.56 and 762.83 ± 9.82 days respectively.
vi) The overall mean for age at first calving was estimated to be 1013.48 # 9.83 days.
vii) The estimate of overall mean for calving interval varied between 411.38 19.52 days to 455.11 18.0 days.
viii) The overall gestation length varied between 259.33 +2.33 and 290.00 0.0 days.
ix) The average herd service period was recorded to be 185.45 ± 8.10 days.
x) The overall lactation length of the herd was 305.69 ± 2,97 days whereas the overall mean for lactation yield was 2973.25 44.25 kg.
xi) The overall HCI, PCI and ACI during the present study were recorded to be 434.76 ± 6.38, 455.45 +9.79 and 455 45 days, respectively.
xii) The fertility index of the herd was found to vary during different parities and ranged between 41.27 and 52.92. It was highest during 4th parity and minimum during 1st parity.
xiv) It was felt during the study that accurate recording of reproductive events. was extremely important in order to come to any conclusion. Moreover, the fertility index calculated with this farm during the present study needs to be compared with come more farms for conclusive reporting.