Investigation of bovine abortion and stillbirth/perinatal mortality - similar diagnostic challenges, different approaches

Table 2 Birth weights (kg) (no. records, mean, mean + 2SD, range) and gestation length (Ges, days) of fullterm (260–300 days), singleton (n = 10,422) and twin (n = 615) calves of different breeds and crossbreeds

Dam genotype	Sire genotype	Singletons					Twins
Dam genotype	Sire genotype	No. records	Birth wt. mean	Birth wt. mean + 2SD	Birth wt. range	Ges. days	No. records	Birth wt. mean	Birth wt. mean + 2SD	Birth wt. range	Ges. days
Jersey, JerseyX	Jersey, JerseyX	200	26.21	16.54–35.88	14–45	281.15	6	21.83	10.92- 32.74	15–30	284.66
Jersey, JerseyX or dairy	Jersey, JerseyX or dairy	919	32.63	20.31–44.95	14–51	280.34	32	26.63	22.04- 31.22	15–34	277.87
Dairy (excl. Je, JeX)^a	Dairy (excl. Je, JeX)	7960	41.84	29.61–54.07	11 to 76	281.62	496	34.14	23.18–45.1	18–55	277.02
Dairy (excl. Je, JeX)	Beef^b	1343	42.82	30.86–54.78	18–63	283.6	81	35.07	22.45–47.69	21–51	278.86

^aDairy (excl. Je, Jex) = Holstein-Friesian, Friesian, Friesianx, Ayrshire, Norwegian Red, Norwegian Redx, Swedish Red,
Swedish Redx, Montbeliarde, Montbeliardex, Normande, Normandex
^bBeef = Aberdeen Angus, Belgian Blue, Blonde D’Aquitaine, Charolais, Hereford, Limousin, Simmental
Source: Teagasc dairy research herds

ISSN: 2046-0481