Failure in pregnancy after insemination until the health of calving nightmares
In the pathology and management of dairy heifers, it can be said that failure in pregnancy after insemination to the health of calving has become a nightmare for dear dairy farmers.
In the open days of pregnancy, livestock income, minus the cost of feed, decreases per day from the birth interval with the increase of open days.
The length of open days is greatly affected by the environment and the increase in cumulative milk production in early lactation prolongs the open days. The interval between delivery and the beginning of the next pregnancy is called open days. The effect of the same open days on milk production in different calves is different. The non-linear relationship between open days and the amount of cumulative milk production indicates that in order to obtain the maximum milk production in the second lactation period, it is necessary to have a 60-day dry period.
Evaluation of open days of pregnancy
In evaluating open days of pregnancy and its relationship with some components of blood, milk and food in Holstein dairy cows, it can be said that the average of urea, creatinine, beta-hydroxybutyrate, phosphorus, magnesium, hematocrit, hemoglobin and blood leukocytes are different among cows. Gives that with increasing protein and calcium in food, urea, protein and magnesium in the blood and magnesium in milk, open days of pregnancy increase.
Also, with increasing hemoglobin and blood phosphorus, milk urea, protein and phosphorus in the open days of pregnancy decrease. The most influential factors in the open days of pregnancy are blood and milk indicators. Changes in total protein and macrominerals and urea are prominent indicators in the open days of cattle.
The importance of recording And reproductive calendarcation
A 21-day reproductive calendar acts as a great system for recording reproductive events, as part of estrus diagnosis is thinking about the future to predict the upcoming estrous cycle.
Because the pregnancy rate for the first insemination should be between 50 and 60 percent, predicting the recurrence of inseminations can accurately diagnose estrus by cleverly searching for symptoms of estrus, such as 1 reluctance to eat, a sudden drop in milk production, and a change in behavior. And 4 increases the flow of clear fluid (from the vagina). Estimates of estrus detection have been used with varying degrees of success
Earlier, in a detailed article, we described 5 items of the most important factors affecting the estrus of dairy cows in the herd
Affecting factorchoose On pregnancy rate
Unfortunately, in the general belief of dear farmers, only the superior quality of sperm has been considered. However, the probability of pregnancy in scheduled artificial insemination is less affected by the fertility background of the superior sperm and most of the factors related to cattle, which are
- Frequent births
- Milk production
- Breastfeeding days
- Energy balance
- Insemination frequency
- Health, accuracy of estrus diagnosis
- Insemination schedule
- Sperm maintenance and management in livestock
- The skill of the inoculation technician