Kumar A.,Grass farm Road |
Singh U.,Grass farm Road |
Kumar S.,Grass farm Road |
Beniwal B.K.,Grass farm Road |
Beniwal B.K.,Veterinary College
Indian Journal of Animal Sciences | Year: 2013
Records of 1 024 Frieswal cows maintained at Military Dairy Farm, Meerut, during 1987-2007 were used to study the lactation specific survival pattern, herd structure, expected herd life and overall life time statistics. Study revealed that 76% of the total cows at first lactation were survived for next lactation and vis-à-vis 24% cows left the herd after completion of first lactation. The probability of a cow to survive in the herd decreased along with the lactation number. Herd structure showed that about 37% of the herd comprised first calvers and about 80% of the total females present in the herd belonged to first 3 lactations only. The expected herd life at first lactation was 2.05 lactations more and follows a decreasing trend along with the increase in lactation. Average net reproductive rate was 0.86, which indicated that each cow produced less than one female calf. It was observed that the proportion of cows being lost from the herd was 0.24 in first lactation. This is the equilibrium replacement rate required to maintain the herd size.
Mathur A.K.,Grass farm Road |
Mathur A.K.,ET Laboratory |
Prasad R.,Grass farm Road |
Sharma S.,Grass farm Road
Indian Journal of Animal Sciences | Year: 2011
Delayed puberty and prolonged anoestrus are the most frustrating problems in crossbred cattle. To overcome this problem in Frieswal females 3 trials were conducted. In the first trial 7 heifers having mean age 23.6±2.4 months were fed a combination of progesterone and oestrogen (1.2 mg levonorgestrel + 0.24 mg ethinylestradiol) along with a mineral mixture @ 40g/day/head for 10 days. In the second trial same treatment was repeated in 10 heifers (mean age 28.2±2.32 months). In the third trial 20 Frieswal fermales having mean age 56.59±5.50 months were fed combined preparation of progesterone and oestrogen (1.2 mg norgestrel + 0.24 ethinylestradiol) per day along with 50g of mineral mixture chillated/head/day for 10 days, whereas 6 heifers were kept as control. Oestrus was observed daily twice in the morning and evening throughout the experimental period with the help of a teaser bull. It was observed that trial in 1, 2 and 3; 71.4, 70.0 and 80% females exhibited oestrus within 45 days. However, in control group only 33% heifers exhibited estrus after 11.5±4.5 days. The estimation of copper and zinc indicated that concentration of these minerals were sub normal in all the treatment groups before the start of the experiment. These studies indicated that feeding of combined preparation of progesterone and estrogen can be used as the most economical and convenient method to overcome the problem of anoestrus in Frieswal females.