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.
1 Feed her correctly. 2  Feed the heifer so that she is in a body condition score (BCS) of 5.5 - 6 at calving and breeding time. 3  Heifers that are in adequate condition will have the best opportunity to breed and then rebreed for their second calf. From weaning to calving, a heifer should be gaining at a rate of 1.5 to 1.75 lbs/day. 2  At breeding time, heifers should weigh at least 65-70 percent of their mature body weight.