Managing Reproduction

Posted by Dr James D Ferguson on Thursday, February 2. 2017

If pregnancy rate (PR) is less than 20% you should be using a synchronization program for first insemination
If days between breedings is greater than 42 days you should be using a postbreeding synchronization program coordinated with pregnancy examinations
Compliance with a program can be evaluated using REPMON
1. distribution of days to first breeding
2. distribution of days between inseminations

Problem(s) - PRs less than 18% on a synchronization program
1. compliance is low - too many inseminations not synchronized
2. CR less than 30%
CR problems - questions to verify
1. is the inseminator competent
2. is semen of good quality
3. are the cows fertile
3.1 have cows cycled prior to 30 days postcalving
3.2 have cows received lutalyse injection prior to 40 days postcalving
3.3 proportion of cows with periparturient problems >40% (dystocia, RP, metritis, milk fever, ketosis, DA, lameness, mastitis, high linear score)
3.4 have cows lost more than ¾ of a body condition score
3.5 are cows below a 2.5 in BSC at insemination
4. are cows milking over 90 pounds at first insemination
5. seasonal influence on CR
REPMON use for trouble shooting CR problems
1. are there significant differences in CR between parity groups
2. are there significant differences in CR between days postpartum
2.1 time effects on DFB
2.2 changes in CR from first to second to third insemination
3. seasonal effects by calving or breeding season

CAHP Software Information