Linear Measurement Female
1. The top line is the total length of the animal from front of pool to back of rump. The top line is taken for three measurements, Neck length, Body length and Rump length. These three measurements make up the total top line length.
TOTAL TOP LINE FOR BULLS ONLY
2. Total top line or true top = 2/3 top line X 1.5 (.5, 1.0, 1.5). Example: If the bull was 70 inches long and his 2/3 is 48, his neck length would be 22 inches long (70 inches – 48 inches = 22 inches). (Formula). Multiplying by 1.5, (1.5 X 48 = 72) you get the true top.
3. The total distance around of the animals heart girth. The heart girth should be equal to the total top line or larger at 12 months of age. The large girth is needed for proper size for vital organs (heart, lungs, glands). The closer the heart girth is to the top line, the more efficient, adaptable and vigorous the animal is. If heart girth is larger than top line it is a plus. Insufficient heart is a high indicator of structural defects, allows front feet to toe out, hooked toe, more susceptible to stress and is a high maintenance animal. They do not perform well on grass. Reproduction suffers. Small heart girth is a structural defect and should not be tolerated.
4. Actual neck length minus half the body length ( 24 –22 = -2). The higher the levels of testosterone, the more crest development, the shorter the
LENGTH OR 2/3 TOP LINE
The 2/3 top line is composed of the rump length and back length.
Distance from the middle dip in vertebrate (chine bone) between the
blades to back of rump. If the back is to long it affects the neck
and the animal is out of balance. Long backs tend to be weak and will
Most long backs have too small a loin muscle. The long backed animals
a dip from loin to top of the shoulder. There will be a dip from rib
to shoulder blade.
This breaks or dip are a structural defect and should not be tolerated.
6. The rump length percent is the percentage the rump makes up of the body length or the 2/3 body length. Divide the 2/3 body length into the rump length. Rump length percent in the bull influences the neck length in his daughters. Less than 40% rump length in the bull increases the neck length of his daughters and makes for a smaller heart girth, thus higher maintenance. A long neck in females is not symbolic of femininity. A range of 38% to 40% is ideal, less than or more than is in the extremes This range works best and will make adequate milking daughters. The rump length percent sits the standard for the degree of masculinity in the bull. If the rump length is below the 38% level, the standard for masculinity is much lower. The low standard does not create rugged bulls and in most cases the scrotal is less than 38 centimeters at 12 months.
7. Divide the rump height into the rump width = rump width percent. This number should be 44% or greater. Greater is better. (example 24 rw. by 50 rh = 48% rmp. Wdth%). High rump width percent is indicative of early maturity and ease of keeping. Bulls with higher rump width percent usually have wide shoulders, deep chest and a more acceptable scrotal. With good rump width% the animal normally has a better chest & shoulder area.
8. Shoulder width minus rump length. Adjusted shoulder width in bulls should be +2 inches or greater at 12 months of age. Greater is better. Wide shoulders makes room for vital organs (heart & lungs). Masculinity is responsible for:
9. Correlates highly with gain-ability. Extremely tall animals tend to be out of balance due to slow puberty development, which lowers reproductive efficiency.
The flank circumference should be 0 with heart girth to 2 inches
larger than heart girth.
Small flank measurement is indicative of absence of meat on rump. The same will be passed on to the progeny.
11. Thurl should be 13% of the rump height or greater. Greater is better if the slopes of the rump is of the proper angle.
The scrotum of yearling bulls should be 38 to 40 centimeters.
Larger or smaller is in the extreme and should not be tolerated.
The scrotum should be football shaped with the epididymis on the very bottom of testicle. If the epididymis is anywhere else but on bottom, the results shows up in the quality of udder of the daughters. The sons will have the same problem as the sire or worse with irregular shaped testicles (recessive genes). If the nipples of the sire are on the neck of the scrotal sack the daughters udders will be tilted up in font and lower milk production. If the nipples of the sire are on the scrotal neck his sons will have a large navel area with the opening pointing toward the ground and fertility is lower. Irregular shaped testicle and epididymis causes irregular and cylinder shaped udders, large nipples and causes udders to sag and break down.