Extent and pattern of pregnancy losses and progesterone levels during gestation in Swedish Red and Swedish Holstein dairy cows

Table 3 Least square means (SE) for progesterone concentrations at the day of insemination (P4day0), day 10 (P4day10), day 21 (P4day21) and day 30 (P4day30) after AI for pregnant cows and cows subjected to pregnancy losses (non-pregnant) at days 1–24, 25–60 and 61-calving after AI for Swedish dairy cows

Pregnancy loss at day	Progesterone concentration (ng/ml) (SE)
	P4day0		P4day10		P4day21		P4 day 30
	Non-pregnant	Pregnant	Non-pregnant	Pregnant	Non-pregnant	Pregnant	Non-pregnant	Pregnant
1–24	2.37 (0.20)	2.01 (0.16)	16.90 (0.42)^a	19.97 (0.31)^b	10.43 (0.68)^a	27.90 (0.39)^b	–	–
25–60	3.14 (0.28)^a	2.10 (0.19)^b	18.11 (0.57)^a	20.46 (0.32)^b	22.56 (0.78)^a	28.84 (0.42)^b	12.89 (1.37)^a	32.08 (1.03)^b
61-calving	2.56 (0.27)^a	1.42 (0.16)^b	21.18 (0.76)	20.35 (0.36)	25.94 (1.08)^a	29.22 (0.43)^b	27.74 (1.98)^a	32.22 (1.10)^b
1-calving	1.70 (0.16)^a	1.32 (0.19)^b	17.66 (0.39)^a	19.64 (0.47)^b	18.86 (0.60)^a	28.69 (0.67)^b	20.30 (0.86)^a	30.72 (0.97)^b

^{a, b}Means within interval (days 1–24 after AI, days 25–60 after AI, day 61 after AI to calving, and 1 day after AI to calving) with different superscript are significantly different P ≤ 0.05

ISSN: 1751-0147