The term BA15 means Bayonet base with 15mm in diameter. A BA15 bulb is commonly known by industry standards as the following bulb size: 1156 7506 7527 1157 2057 2357 7528 P21W P21/4W, etc. These BA15 bulbs are commonly use for turn signal, tail/stop lights, reverse lights and daytime running lights.
Depending on the breed of the heifer, most heifers will start to show the first signs of heat when they are between 9 and 22 months of age. 1  The rate of sexual maturity or puberty is determinate of genes and breeding. A deep, long, and wide rump is a very good sign that that heifer is a keeper. 2  You will always know when a heifer or cow is ready to be bred when they go into heat. 3  Normal estrus periods last 24 hours and occur between 17 to 24 days.
Normally, it is a good idea to breed heifers one month ahead of the main cow herd; so, we need to get heifers that have a mature weight of 1,200 pounds to weigh 780 pounds by the time they are 12-14 months old.ext, use a short breeding season. Do not give heifers more than 75 days to breed. Eliminate heifers that do not conceive during this first breeding season. This helps raise the fertility level of cows retained in the herd.