Realistic Production Levels

Please read the articles associated with the following websites:

The production can be use to:

 

NPD = 365-[L/S/Y x (GL+LL)]
NPD = Non Productive Sow Days
L/S/Y = Litters per sow per year
GL = Gestation Length
LL = Lactation Length

Projected L/S/Y
365-NPD
(GL + LL)

NPD = all days that the gilts and sows are not gestating (pregnant) or lactating
Farrowing Interval = 365/L/S/Y

 

Table 1. Production Management Schedule
No. of Litters/Sow/Year

Weaning Age
(Wks)		 Gestation
(days)		 Lactation
(days)		 Rebreed
(days)		 Total
(days)		 Litters/Yr.
3 114 21 10 145 2.5
4
114
28
7
149
2.4
5
114
35
5
154
2.3
5
114
42
5
161
2.2
8
114
56
5
171
2.0

Assume 100% conception rate, ideal conditions no death loss, abortions, culling after breeding.
Day 5 to rebreed are NPD.  Lactation length increased farrowing interval and decrease litters/sow/yield.  Lactation length does not affect NPD.  In this case NPD=L/S/Y x rebreeding.

 

Table 2. Unproductive Sow Days Per Farrowing

Item Target Level Interference Level
Weaning to First Service
6
8
First Service to Effective Service
3
7
Sows Culled - without being served
2
5
Sows Culled - after being served
4
10
Sow Deaths
1.0
3.0
Sow Abortions
0.5
1.o
Unproductive Sow Days/Farrowing
16.5
34
     
Gestation
114
114
Lactation
21
21
These days ↑ F.I.
16
34
Farrowing Interval
151
169

 

Service Management

A principal aspect affecting Litter/Sow/Year is 'service' management. Table 1 highlights how the top performing farms tend to:

These are key areas you need to review in your operation to assess any opportunity for improvement.

 

Table 1. Trends in Service Management - 21 day weaning

Item Avg. Top 33% Top 10%
Average Repeat %
12.4
10.0
8.9
Mating/Service
1.91
2.09
2.09
Farrowing Rate
77.1
83.2
85.7
% Returns re-serviced
53.9
59.5
62.2
F.I.
170
155
152
L/S/Y
2.18
2.36
2.40

 

Table 1. Biological Maximum Litters/Sow/Year

  Weaning Age (wks)
Item 3 4 5
Gestation Length (Days)
115
115
115
Lactation Length (Days)
21
28
35
Weaning to Service (Days)
5
5
5
Farrowing Interval (Days)
141
148
155
Litter/Sow/Year
2.59
2.47
2.35

 

Age Weight expected
56 days
42 lb.
70 days
57 lb.
107 days
108 lb.
139 days
162 lb.
168 days
217 lb.
183 days
250 lb.
194 days
270 lb.

 

Seed Stock Firms:
www.pic.com/usa
www.swinegenetics.com

Large Producers:
www.carrollsfoods.com

ANSC 443 Home Page
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