APPENDIX B - Statistical AI

The erect penis varies in length from three to five inches (as measured tip-to-base). In time the length and firmness of an erection will decrease, therefore it is advised that these measurements be taken at least once a year for a breeding snarf.

If L is the length of the erect penis in inches, then:

c = (L-2)/4

where C is the concentration of sperm in parts per hundred million (pphm). NOTE: a snarf with a penis less than three inches long is not sexually mature and cannot produce sperm.

Testicle size will vary not only with age but also during the coupling act; therefore the measurements should be taken immediately before and after the snarf breeds. Each testicle is to be measured individually with calipers.

If L and W are the average length and width of a testicle in inches, then:

T = (L1/W1 + L2/W2)

where T is the fraction that represents virility.

C and T combine to give an expression for A, the number of active, healthy sperm:

A = T C exp(T/To)

where To has the standard value of 2.15 and A is in pphm. For the average snarf, A is about equal to fifty pphm. If a snarf has an A value of less than twenty-five pphm, then it must either be euthanized or removed from the breeding process. If a snarf has an A value of greater than 60pphm, then it qualifies for cross-snovel breeding. (CONTROL cd code p.83, ss.7, par.1)

Fertility in the bitch is inversely proportional to vaginal depth. The average vaginal depth is four to six inches. It is important to measure the length of the canal while the bitch is not in heat and the cervix is shut. Carefully insert a sanitized and calibrated rod (the zero end first) through the vagina until the cervix blocks its motion. Let the hook lips envelope it and firmly place a thumb immediately over the flesh. Nudge the ruler out and read off the value next to the finger to the nearest 16th of an inch.

If L is vaginal depth in inches, then:

N = 16/L

where N is the number of snarves per liter that the bitch is most likely to produce. It is important to check the value of N with the actual average value of snarves per liter. If the actual average differs from N by more than twenty percent, then the bitch must either be euthanized or removed from the breeding process. (CONTROL cd code p.83, ss.7, par.2)

All of the statistics for this appendix have been provided and verified by the USLO.