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2 edition of Genetic evaluation of young boars and gilts for sow productivity. found in the catalog.

Genetic evaluation of young boars and gilts for sow productivity.

Ben Bereskin

Genetic evaluation of young boars and gilts for sow productivity.

  • 226 Want to read
  • 26 Currently reading

Published by U.S. Dept. of Agriculture, Agricultural Research Service in Washington, D.C .
Written in English

    Subjects:
  • Sows -- Genetic aspects.,
  • Wild boar -- Genetics.

  • Edition Notes

    SeriesProduction research report -- no. 182.
    ContributionsUnited States. Agricultural Research Service.
    The Physical Object
    Pagination29 p. :
    Number of Pages29
    ID Numbers
    Open LibraryOL15261117M

    A study was conducted to evaluate the effect of decreasing age of puberty on lifetime productivity in sows. Two lines of gilts from the Nebraska Gene Pool population were used in this study: a line that had been selected for decreased age at puberty (AP) and a line in which selection had been random (RS). That was an incredible litter. The pedigree reads The Program x Bachelor Party x Untouchable. Function and Sow productivity is extremely good in that litter of sows. is maybe the most exotic and extreme of a breeding piece of all the gilts we are offering in terms of . Goals / Objectives 1) Determine prenatal, postnatal and prepubertal factors influencing puberty onset and develop strategies to reduce puberty failure. - Sub-objective 1.A. Establish the effects of neonatal litter size on development of the reproductive tract of gilts. - Sub-objective 1.B. Establish the long-term effects of the size of neonatal litter in which the gilt is suckled on feeding. Sow lifetime productivity is an extremely complex and difficult trait to study. presence of varicocele in a large population of young boars and derived the genetic heritability of vessel area.


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Genetic evaluation of young boars and gilts for sow productivity. by Ben Bereskin Download PDF EPUB FB2

Get this from a library. Genetic evaluation of young boars and gilts for sow productivity. [Ben Bereskin; United States. Agricultural Research Service.] -- Verslag van een onderzoek (op grond van een statistische analyse van fokresultaten uit de Verenigde Staten) naar de betekenis voor de nauwkeurigheid van de fokwaarde van het betrekken van gegevens.

For gilts to be successful in the Genetic evaluation of young boars and gilts for sow productivity. book herd young breeding females must be carefully selected and developed. Genetics The most important genetic considerations are performance testing methods, selection objectives, and crossbreeding program (See, ).File Size: KB.

Selection is the most powerful tool in making permanent genetic improvement in swine. There have been no long-term selection studies targeting the subject of this Blueprint — pigs weaned/sow/year (P/S/Y) — although there has been considerable research on selection for the major components of this popular measure of productivity.

Today’s gilts grow faster, reach puberty at heavier weights, and are mated both younger and leaner. Therefore, we are ultimately managing a more prolific mature sow that may be both leaner and larger in mature body size.

For gilts to be successful in the breeding herd, young breeding females must be carefully selected and developed. Genetics. 5. Age at puberty – Studies clearly show, within a cohort of gilts, younger puberty females have superior gilt and sow retention.

Hence age at puberty is a good indicator of sow lifetime productivity. Puberty is a trait that can be difficult to capture, thus age. Pigs weaned per sow per year (PWSY) The number of pigs weaned per sow per year (PWSY) [] is commonly used as a benchmarking measurement to compare the productivity of breeding herds, either between herds in a country or between target values for PWSY have increased from 20 to 30 pigs over the last three decades, and it is likely that genetics and sow.

* Long bodied, high-volumed gilt with a high sow-productivity index, which should indicate more productivity as a sow. * A bigger framed boar with more natural muscle over his top, combined with a lower backfat scan, indicates that the boar should sire progeny that stay leaner to a higher weight.

Exposure of peripubertal gilts to boars for 20 min/d stimulates expression of estrus. Boars must be mature (>10 mo of age) and express the full complement of male mating characteristics. For best results, gilts are brought to boars where initially, gilts experience the sight, sound and odor of the boar with fence line contact.

Long bodied, high-volumed gilt with a high sow-productivity index, which should indicate more productivity as a sow. A bigger framed boar with more natural muscle over his top, combined with a lower backfat scan, indicates that the boar should sire.

Genetic evaluation programs can be used to predict the genetic merit of the animals for specific traits. These programs combine records on the individual with information on relatives in an in-depth analysis, resulting in very accurate genetic evaluation.

days to lb, and backfat thickness are measured on boars, gilts, or barrows. For a. a) Mature gilts and boars Live pigs can be brought into your herd from a source herd of matching health status, or through SEW or hysterectomy and fostering if the source herd is of known but lower health status (depending on the disease to Genetic evaluation of young boars and gilts for sow productivity.

book eliminated). The genetic correlation among sow survival obtained with LG22 (the best fit model) ranged from toto for Landrace and Large White sows, respectively. Results from this study indicate that RRM could be used for genetic evaluation of sow survival.

Many diseases that affect grower/finisher pigs (see Lameness in Pigs in Grower/Finisher Areas) can also affect young gilts and boars selected as breeding tis caused by Mycoplasma hyosynoviae or acute or chronic erysipelas can cause an incapacitating lameness.

Polyarthritis and polyserositis caused by M hyorhinis are seen occasionally in these older pigs. ABSTRACT. Data from the National Pork Producers Council Maternal Line National Genetic Evaluation Program were used to compare longevity of sows from 6 commercial genetic lines and to estimate the phenotypic associations of sow longevity with gilt backfat thickness, ADG, age at first farrowing, litter size at first farrowing, litter weight at first farrowing, average feed intake during.

per sow per year (Table ). However, genetic selection for lean tissue growth may have inadvertently influenced the breeding potential of the sow through a reduction in body fat content and appetite. Thus, the modern sow, which has a higher mature body weight, is expected to have a higher annual sow productivity.

Twenty (20) of the 80 available gilts need to be selected each month if sows are kept only for 1 litter, 10 if sows are kept for 2 litters, and similarly, for 3, 4, 5 and 6 litters/sow. Also, assume that 1 boar is needed for each 15 sows or 8 boars for the sow herd and boars are used for either 3 months, 6 months, 1 year, 2 years, or 3.

Sow Farms. Gilts entered 1 of 2 commercial sow farms near Rockingham, North Carolina, at an average age of d. Farms were modern confinement facilities that housed either 4, or 2, sows. Throughout gestation, females were fed according to body condition (Patience and Thacker, ) and had continuous access to water.

Detection of estrus. The high and positive genetic correlations between LPL and lifetime production traits indicated that preliminary EBV for gilts and boars using records from relatives could be used to preselect young animals to improve LPL, LBA, LPW, LBW, and LWW. Age at puberty, defined in gilts as age at first standing estrus in the presence of a boar, is an important component trait of sow lifetime productivity [1][2] [3].

Gilts that reach puberty. Twenty (20) of the 80 available gilts need to be selected each month if sows are kept only for 1 litter, 10 if sows are kept for 2 litters, and similarly, for 3, 4, 5 and 6 litters/sow.

Also, assume that 1 boar is needed for each 15 sows or 8 boars for the sow herd and boars are used for either 3 months, 6 months, 1 year, 2 years, or 3. Estimates of the genetic correlations between DGE ( ± ) and SGE ( ± ) for boars versus gilts indicated that ADG in boars and gilts are different traits.

Moreover, the estimate of the genetic correlation between DGE and SGE indicated presence of genetic effects of competition among gilts but not among boars. A gilt’s response to early boar exposure has been shown to be a viable option for estimating her lifetime productivity as a sow.

Unfortunately, providing adequate boar exposure at young ages poses several practical and biosecurity issues for many multiplication farms. Boar exposure stimulates the brain to produce gonadotropins which, in turn. Sow productivity index is an indicator for a sowís reproductive traits.

This index combines the NBA and day LWT. The group of animals that is used as a point of reference for the genetic evaluation. The average EPD for this population is 0, and the average index is A young boar or gilt with postweaning data submitted in the.

Source:American Yorkshire Club National Genetic Evaluation. PURPOSE: Herd boar in multiplier portion of a sow commercial operation that produces its own F1 York x Landrace gilts for ION: Herd operates with a good supply of feed and management are kept as replacement females, males are sold as barrows.

Gilts indexing produce F1's that return an extra $6, per year for a herd of 2, market hogs. Pork production systems based on accurate EBVs, good management and effective cross breeding have consistently produced 24 or more fast growing, high indexing pigs per sow per year.

His first test station pen topped the Purdue Station with one boar at ADG, BF, LEA and FE. In addition to the documented tremendous sow productivity and leanness of the Ulf line, MASTERPLAN adds another dimension of superior growth as evidenced by his EPD for days of – Sows vs.

Gilts What are the benefits of each. What is the suggested replacement level. (turnover, like what percent will cull and you will replace with gilts) Boars contribute most of the genetic material.

How many piglets do you get from a sow a year. How many pigs will you get from a boar. A boar that sired a recorded litter in the past 12 months. Active Sow. A sow that farrowed in the past 12 months. Active Young Pig. A young boar or gilt with postweaning data submitted in the past 12 months.

Adjustment Factors. Equations or constants used to remove non-genetic effects on performance. Ensure that first mating is successful. Use a small, quiet sow or gilt in good estrus.

Mating in boar's pen may be the best location since the male is not distracted by new surroundings. Wait until months of age before regular use, times per week until one year of age.

Mature boars can perform services per week. Boar to Sow-Gilt Ratios. A BALANCED PROGRAM EQUALS MORE TOTAL PROFIT. At Cedar Ridge Genetics, we are confident that when you consider all things including productivity, longevity, growth rate, feed efficiency, carcass yield, loin depth and lean muscle content into an overall evaluation, our genetic program will excel and provide maximum profit potential for any modern production system.

Sam MILLET, Research group leader of Institute for Agricultural and Fisheries Research, Merelbeke (ILVO) | Read publications | Contact Sam MILLET.

In pig breeding, we select the best animals among the young boars and gilts. Therefore, it is necessary to gather information on longevity from the young animals’ dams, grandmothers, and aunts. Information on longevity is distantly related between the young gilts and boars selected for longevity and the offspring for the next generation.

Simultaneous advances have been made in the number of pigs a sow can produce each year, predominantly due to management, and in lean (growth rate and percentage), predominantly due to genetics. Today’s gilts grow faster, reach puberty at heavier weights, and are mated both younger and leaner.

Therefore, we are ultimately managing a more prolific [ ]. Swine Genetics International, AI Manual Online AI Manual Table of Contents Introduction Why Use Artificial Insemination U.S. National Genetics Evaluation Cost of Natural vs. Al Service The Economic Value of Superior Sires Breeding Programs To Facilitate Al Boar Selection Criteria Health Advancements Through Al Boar Health and Management.

However, breeders should select high indexing, young boars due to the annual genetic progress that occurs in most breeds. Due to the low accuracies on these boars, breeders should avoid using any one young boar too extensively.

It is better to use a group of young boars along with a few proven sires as a way to reduce the overall selection risk. The evaluation of ovulation rate and uterine capacity from late parity females from weaning potential and productivity quadrants sow will be initiated at the completion of the large progesterone evaluation project (1A) in mid-FY Pig farming is the raising and breeding of domestic pigs as livestock, and is a branch of animal are farmed principally for food (e.g.

pork, bacon, gammon) and skins. Pigs are amenable to many different styles of farming: intensive commercial units, commercial free range enterprises, or extensive farming (being allowed to wander around a village, town or city, or tethered in a.

However, it could be possible to record age at the start of the mating period or at oestrous stimulation (first boar contact, transport or mixing of gilts) if gilts are reared in strict batches. Such a record, included in the statistical model as a fixed effect, could be helpful in an evaluation.

For a guaranteed not bred sow order two months ahead and we can arrange for her not to get re-exposed to a boar after she farrows. 3) Sow vs Gilt: Gilts are young females that have not yet farrowed, that is to say given birth, to their first litter of piglets. The first litter is always a learning experience for a new mother and first litters.

Boar sow ratio is usually one boar per 20 sows with supervised hand mating, but in small herds or under extensive conditions, the ratio could be between 15 and 18 sows per boar (Taylor et al., ). In pen -mating systems, a young boar is required for every sows, and an older boar for every sows for a 7 day breeding period.

- Sub-objective 3.A. Evaluate phenotypic factors and identified genetic regions that influence sow longevity. - Sub-objective 3.B. Investigate the influence of sow feed efficiency, metabolic activity and lactation performance during and after lactation on piglet survival, piglet growth and post-weaning reproduction performance of sows.

1b.Goals / Objectives 1) Identification, measurement and genetic evaluation of economically important traits that will increase efficiencies of pork production and support value-based marketing systems.

2) Evaluation of genetic differences among pure and commercial swine populations and their interactions with different components of the production system.Young elite boars are used to produce crossbred pigs in real-world production facilities to measure and select for robust, predictable commercial performance.

The sow farms and finishers are located across 4 continents, and they are located in pig-dense areas, having conventional health and typical commercial production environments.