Gilt litter – impact of future performance
The gilt with the small
first litter never performs as well as a gilt which
has an excellent first litter.
Born Alive in the first litter and subsequent performance
|
1st
parity litter |
2nd
parity |
3rd
parity |
4th
parity |
|
6 |
9.4 |
9.1 |
9.9 |
|
7 |
8.9 |
9.1 |
9.9 |
|
8 |
9.4 |
11 |
11.5 |
|
9 |
9.5 |
10.5 |
10.3 |
|
10 |
10.1 |
10.6 |
10.8 |
|
11 |
10.1 |
11.1 |
11.9 |
|
12 |
10.6 |
11.1 |
12 |
|
13 |
10.6 |
11.1 |
11.4 |
|
14 |
10.8 |
11.1 |
11.4 |
|
15 |
10.8 |
13 |
14 |
|
16 |
10.5 |
16 |
14 |
Three
particular total born alive litter sizes are shown for
emphasis – 7, 10 and13.
It is essential to maximize the size of the first
litter.
Note this is only one of many features – Fostering,
numbers weaned and lactation feed intakes all play vital roles in predicting
future parity performances.
When the data is analysed as a lifetime performance
(WA farm)
|
Born Alive First Litter |
Lifetime average born
alive |
Number of sows |
% of sows |
|
<6 |
6.6 |
1233 |
9.1 |
|
6 |
7.9 |
592 |
4.4 |
|
7 |
8.6 |
882 |
6.5 |
|
8 |
9.1 |
1278 |
9.4 |
|
9 |
9.7 |
1670 |
12.3 |
|
10 |
10.2 |
2029 |
15.0 |
|
11 |
10.7 |
2091 |
15.4 |
|
12 |
11.2 |
1730 |
12.8 |
|
13 |
11.8 |
1088 |
8.0 |
|
14 |
12.4 |
576 |
4.3 |
|
15 |
12.75 |
248 |
1.8 |
|
16 |
13.1 |
91 |
0.7 |
|
>16 |
13.8 |
34 |
0.3 |
|
|
|
13542 |
|