Table 2.

 

Storage interval

The effects of ageing on the fertility of fresh
and frozen bull semen

Characteristics

 

Fresh semen

Frozen semen
7-14 days

6 months

1098

1l year

2 years
4 years
8 years

12 years

Cows bred
Fertility,

Cows bred
Fertility,
Cows bred
Fertility,
Cows bred
Fertility,
Cows bred
Fertility,
Cows bred
Fertility,
Cows bred
Fertility,
Cows bred
Fertility,

%

%
%
%
%
%
%

%

 

24H

38
{849

20
65.0
39
7859
22
54.5
20
5504/0
319
47.4
20
45,0

50510

Bull identification

H101

39
64.1

A
80.9
22
7753
20
90.0
21
61053
274
619
21
71.4

50.0

H88

42
F8rerd

£9
788
17
70.6
19
TSV
1iée)
8935
18
5010
22
686
il
36.4

H89

32
50,0

20
40.0
211
66.7
21
Sk
22
54.5
18
Bt
22
63.6

40.0

Totals
and
H103 Means

24 175
62.5 66.8

19 99
63w 6516
18 O
5556116938
20 102
5520 16632
20 102
70406602
20 96
6O NOMNTE G
2% 106
SR 59
- 24
-— 41.7