Journal of Animal Reproduction and Biotechnology

Table. 3.

Table 3

Pregnancy rate Hanwoo cows after artificial insemination using different concentrations of sperm

Sperm concentration/straw	No. of cowsinseminated	No. of pregnant cows at diagnosis

		Day 30 (%)	Day 90 (%)
10 million	63	28 (44.4)^b	25 (39.7)^b
15 million	51	32 (62.8)^ab	30 (58.8)^ab
18 million	46	36 (78.3)^a	34 (73.9)^a
20 million	49	35 (71.4)^a	33 (67.3)^a
	209	131 (62.7)	122 (58.4)

^a,bValues in columns denoted by different superscript lower-case letters differ significantly among groups (p < 0.05). The cows were combined according to the mating program of the Hanwoo Research Institute. Frozen–thawed semen derived from 10 bulls (A–J) was used for AI.

Pregnancy was confirmed through blood testing 30 days after AI and further confirmed by rectal palpation and ultrasound examination at 90 days post-insemination. Cows were considered non-pregnant due to the absence of pregnancy detected by ultrasound examination 90 days after AI, despite the presence of pregnancy at 30 days post-insemination.

Journal of Animal Reproduction and Biotechnology 2024;39:40-7 https://doi.org/10.12750/JARB.39.1.40