first-calf

first-calf

said of heifers aged about 2 years usually, with their first calf just born.
References in periodicals archive ?
We have also found that first-calf heifers are much calmer during the birth process if they have bonded with a human as a newborn.
The Holstein first-calf heifers imported from Canada in 2007 served as the target of our research, as well as their female offspring obtained in Kazakhstan and local white-and-black cattle herd mates.
This paper presents the material to study lactation performance, reproductive capacity, and natural resistance of purebred Holstein first-calf heifers as compared to white-and-black first-calf heifers with 5/8 blood of the Holstein breed.
Milk-producing records for completed lactation were performed based on the data of everyday milk-yield control in 405 first-calf heifers.
Lactation performance in the Holstein first-calf heifers turned out to be higher than in local herd mates by 32-35% (Table 1).
First-calf heifer lactation curves are rather flat; average monthly drop in milk yields throughout lactation was about 5%, but they are double-peaked in Holsteins.
The trend is most pronounced of all in a first-calf heifer which will give more milk in both her first and second lactations if her first calf is female.
The effects of inadequate nutrition during pregnancy are more severe in first-calf heifers than in older cows.
First-calf heifers will be lower in dominance and will probably not receive any of a hand-fed supplement if they are not fed separately from the cows.
To improve the chances for dropping a live healthy calf, bred first-calf heifers should be fed adequate nutrition during the gestation period to support the gain necessary to achieve 85 percent of mature weight by calving.
Ultimately, dairy producers benefit not only from larger calves, but also bigger, younger, more productive first-calf heifers.