## Sow productivity index formula

however, a selection index will be needed to ensure that post-weaning growth traits are not non-productive sow days and to evaluate its relationship with other economically Litters per sow per year was calculated using the formula:. number of pigs weaned per sow (Dial et al., 1992;. Koketsu, 2002). Swine producers and programmers have. defined a formula for an index to support universal. 4 Nov 2013 If the 10 sows behaved exactly the same, the farrowing interval on the farm interval by means of the formula given at the beginning of the article. or non productive days as it also has an influence in the farrowing index and

The formula is simple and is based on actual pigs weaned in the period, (pigs weaned divided by days in period multiplied by 365 days) divided by (total mated sow days divided by days in period). Example is Farm 1, (33,418 pigs weaned divided by 364 days in period multiplied by 365 days) divided by (463,484 mated female days divided by 364 days in period) equals 26.32. sow productivity. litter size, number weaned per litter, 21 day litter weight, & number of litters per year for a sow. growth rate. economically important, adjusted to a constant basis such as days required for pig to reach 205lbs. The output is the company's net sales and the input is the number of hours. The productivity of the company is \$750 (\$15 million divided by 20,000). PWIMAT = Postweaning index for a maternal line PWI = Postweaning index for a terminal sire line TSI = Terminal sire index MLI = Maternal line index SPI = Sow productivity index Economic Values: RBMP = \$.45 = Base market price/lb. live weight for a 48% fat-free lean carcass RLFCST = \$.17 = Labor and facilities cost/day Sow Productivity Index (SPI) is a measure of milking ability and prolificacy. The index combines number of pigs born alive and 21-day litter weight. It is adjusted for sow parity. The index is calculated with EPDs. Terminal Sire Index (TSI) This is a measure of growth, efficiency, and backfat. The index is calculated with EPDs. Sow Productivity Well managed gestation periods improve the fertility and reproductive capabilities of sows throughout their production span as well as overall piglet livability. Beginning at embryo implantation, we work with our customers to ensure optimal results throughout – from managing constipation and digestive issues, to the birth of Selection Index. A formula that combines the EPDs from several traits into a single value for each animal. STAGES weights the EPDs to calculate three indexes which consider the intended use of seedstock in crossbreeding systems and which consider the relative economic value of each trait. Sow Productivity Index (SPI)

## Here are three indexes available: Sow Productivity Index (SPI) is a measure of milking ability and prolificacy. The index combines number of pigs born alive and 21

Sow productivity depends heavily on the management of the breeding female population. This paper will focus on five general management considerations to optimize sow productivity including genetics, nutrition, environment, management, stress and breeding. Figure 1. Critical periods for successful breeding and gestation of sows. Genetics analyzed to give sire and dam litter summaries, sow productivity indexes for sow culling, and general, maternal, and paternal indexes for replacement selection. The sow productivity index (SPI) combines two traits for sow ranking. The index is 100 + 6.5 (L-L) + 1.0 (W-W), where adjusted number_of piglets born Factors affecting the reproductive performance of sows A. University of Leeds - United Kingdom There are many diverse factors which can have a profound effect on the reproductive performance of are: the genotype of the sow and boar, the health status of the herd and the general environment provided for the The industrial production index (IPI) is a monthly economic indicator measuring real output in the manufacturing, mining, electric and gas industries, relative to a base year. A cost of living index can help a person determine whether the income or salary being earned is enough to cover basic expenses. Genetic Optimization of Sow Productivity . M. T. See and S. H. Oh . Introduction. Optimal sow productivity occurs with maximum number of pigs per litter, litters per year and lactation yield while also optimizing pig birth weight, sow longevity and lifetime productivity.

### 2. Multifactor productivity. Whereas the partial factor productivity formula uses one single input, the multifactor productivity formula is the ratio of total outputs to a subset of inputs. For example, an equation could measure the ratio of output to labor, materials, and capital.

The formula is simple and is based on actual pigs weaned in the period, (pigs weaned divided by days in period multiplied by 365 days) divided by (total mated sow days divided by days in period). Example is Farm 1, (33,418 pigs weaned divided by 364 days in period multiplied by 365 days) divided by (463,484 mated female days divided by 364 days in period) equals 26.32. sow productivity. litter size, number weaned per litter, 21 day litter weight, & number of litters per year for a sow. growth rate. economically important, adjusted to a constant basis such as days required for pig to reach 205lbs.

### Productivity index (J) The productivity index is a measure of the well potential or ability to produce and is a commonly measured well property 1 . The symbol J is commonly used to express the productivity index; as well as, being the preferred symbol by the Society of Petroleum Engineers.

Here are three indexes available: Sow Productivity Index (SPI) is a measure of milking ability and prolificacy. The index combines number of pigs born alive and 21  15 Jan 2016 Here, we evaluate the productivity index in gilts and sows during the The formula for calculating NPD is NPD = 365−[(litter/female/year)  Table 2.1. Sow productivity in small and large farms in Singapore. a Farrowing index (litters per sow per year). 2.1. 2.0 Typical population distribution in a closed-herd farm and calculation of mean live weight per SPP (50 kg ALW/SPP). a

## Sow productivity depends heavily on the management of the breeding female population. This paper will focus on five general management considerations to optimize sow productivity including genetics, nutrition, environment, management, stress and breeding. Figure 1. Critical periods for successful breeding and gestation of sows. Genetics

Index for a terminal sire line. PWIMAT. PostWeaning Index for a maternal line. TSI. Terminal Sire Index. MLI. Maternal Line Index. SPI. Sow Productivity Index  Litter weights must be entered at weaning for these formulas to be calculated. It is calculated from one or more sow productivity index ratio records on the

number of pigs weaned per sow (Dial et al., 1992;. Koketsu, 2002). Swine producers and programmers have. defined a formula for an index to support universal. 4 Nov 2013 If the 10 sows behaved exactly the same, the farrowing interval on the farm interval by means of the formula given at the beginning of the article. or non productive days as it also has an influence in the farrowing index and