Improving pregnancy rates in problem breeder cattle by administration of 15 mg of progesterone on days 3–5 post-mating

Figures & data

Table 1. Pooled pregnancy rates for problem breeder cows and control fertile cows during the non-treatment and treatment breeding periods.

Group	Breeding period	n	Treatment	Number pregnant (%)
Problem breeders	Non-Treatment	20	No P4 or altrenogest	0/20 (0%)^a
Problem breeders	Treatment	20	P4 or altrenogest	9/20 (45%)^b
Fertile cows	Treatment	22	Vehicle	14/22 (64%)^b
^a,bValues with differing superscripts within columns represent a significant (P<0.05) difference.

Figure 1.  Plasma progesterone (P₄) concentrations in pregnant (n=9) and non-pregnant RPB cows (n=11) administered 15 mg of P₄ on days 3, 4 and 5 after the onset of estrus.

Figure 2.  Plasma progesterone (P₄) concentrations in pregnant (n=14) and nonpregnant ‘fertile’ control cows (n=8) on days 3, 4 and 5 after the onset of estrus.