scholarly journals Relationships between backfat thickness and parameters of reproduction in the Czech Large White sows (short communication)

2006 ◽  
Vol 49 (4) ◽  
pp. 363-369 ◽  
Author(s):  
M. Čechová ◽  
Z. Tvrdoň
Keyword(s):  
Litter Size ◽  
Test Data ◽  
Performance Test ◽  
Short Communication ◽  
Live Weight ◽  
Field Conditions ◽  
Backfat Thickness ◽  
Large White

Abstract. Relationships between backfat thickness and litter performance for individual parities were analyzed on performance-test data under field conditions of 8,285 Large White sows from 39 farms. Backfat thickness measured by ultrasound was corrected for a live weight of 90 kg. Young gilts with a higher backfat thickness achieved higher litter performance and a higher number of litters. Litter size increased from the first until the fifth parity.

scholarly journals The use of performance test parameters for selection of gilts before their placement into breeding

2011 ◽  
Vol 51 (No. 6) ◽  
pp. 253-261 ◽  
Author(s):  
N. Kernerová ◽  
J. Václavovský ◽  
V. Matoušek ◽  
Z. Hanyková
Keyword(s):  
Performance Test ◽  
Performance Testing ◽  
Live Weight ◽  
Regression Function ◽  
Backfat Thickness ◽  
Daily Weight Gain ◽  
Large White ◽  
Lean Meat ◽  
Meat Content ◽  
Richards Function

The objectives of the paper were to evaluate carcass value in reared gilts on the basis of carcass analysis during the station test of purebred progeny of pigs and ultrasonically with Sonomark-100 or Piglog-105 instruments in the framework of valid methodology for performance testing, and to verify a pos-sibility of prediction of backfat thickness and/or average daily weight gain since birth and lean meat content of gilts as the elements of objectification for the evaluation of their body condition. In total 54 gilts of two breeds were evaluated: the dam breed Czech Large White and the sire breed Czech Large White &ndash; sire line. Four-parameter Richards function was used for growth evaluation. The regression function y = 63.870 &ndash; 0.447 bt<sub>1</sub> &ndash; 0.510 bt<sub>2</sub> + 0.128 MLLT was applied in ultrasonic instruments for the calculation of lean meat content. We calculated linear regression functions for the conversion of performance testing parameters (gain from birth, average backfat thickness and lean meat content) from live weight on the day of measurement per live weight declared during selections in gilts. &nbsp;

The influence of fatness at parturition. nutrition during lactation and litter size on the performance of breeding sows

1988 ◽  
Vol 1988 ◽  
pp. 40-40
Author(s):  
C.T. Whittemore ◽  
H. Yang ◽  
P. Phillips ◽  
P.R. Eastham
Keyword(s):  
Litter Size ◽  
Reproductive Performance ◽  
Production Efficiency ◽  
Present Report ◽  
Live Weight ◽  
Backfat Thickness ◽  
Large White ◽  
Daily Feeding ◽  
Company Limited ◽  
Ad Libitum

The influence of fatness at parturition, nutrition during lactation and the size of litter upon changes in backfat depth, live weight and conformation of sows over four parities has been presented in the first report. The present report will deal with the consequences for reproductive performance and production efficiency.One hundred and two Large White x Landrace Fl hybrid gilts were purchased from the Cotswold Pig Development Company Limited at about 30 kg live weight. At mating, animals were allocated at random to one of B treatments comprising: two levels (fat and thin) of target backfat thickness at parturition (10-14 mm. T vs 20-24 mm. F): two daily feeding levels (high and low) during 4-week lactation (3 kg. L vs ad libitum to a maximum of 7 kg. H): and two sizes of sucking litter (5 vs 9 in parity 1, and 6 vs 10 in parities 2, 3 and 4).

scholarly journals Genetic Trend and Relationship of Meatiness Traits of Different Breed Pigs Raised in Lithuania

2009 ◽  
Vol 63 (1-2) ◽  
pp. 66-69
Author(s):  
Ramutis Klimas ◽  
Asta Klimienė
Keyword(s):  
Correlation Analysis ◽  
Live Weight ◽  
Backfat Thickness ◽  
Genetic Trend ◽  
Large White ◽  
Lean Meat ◽  
Relationship Of ◽  
Observation Period

Genetic Trend and Relationship of Meatiness Traits of Different Breed Pigs Raised in Lithuania The purpose of this study was to determine the genetic trend of leanness for purebred pigs, and to determine the relations between meatiness traits, age and live weight of animals. The estimation of meatiness traits (backfat and loin lean thickness, lean meat percentage) of purebred Lithuanian White (LW), Large White (La.W), Yorkshire (Y), Landrace (L), Duroc (D) and Pietrain (P) pigs grown in breeding centres was evaluated by apparatus Piglog 105, during 2000-2006. In 2006, the average lean meat percentage of purebred pigs in the breeding centres of Lithuania ranged from 56.9% (LW) to 59.5% (D). During the observation period (2000-2006), the genetic trend of the leanness of LW was 6.9% (P < 0.001), La.W and L, respectively, was 2.2 and 2.5% (P < 0.01), D was 1.6% (P < 0.05), Y was 0.2% and P was 0.6%. A higher genetic trend of the leanness in the LW pig breed can be explained by import of English La.W boars. Correlation analysis showed that lean meat percentage of pigs is more related to backfat thickness (r = from -0.84 to -0.95, P < 0.001), than to loin lean thickness (r = from 0.11 to 0.30). Live weight of pigs had more influence on mentioned meatiness traits than age.

A note on the performance, carcass and muscle quality characteristics of pigs sired by Poland China and Large White boars

1973 ◽  
Vol 17 (3) ◽  
pp. 325-328
Author(s):  
J. P. Chadwick ◽  
W. C. Smith
Keyword(s):  
Weight Gain ◽  
Litter Size ◽  
Live Weight ◽  
Quality Characteristics ◽  
Muscle Quality ◽  
Drip Loss ◽  
Large White ◽  
Eye Muscle ◽  
Litter Weight ◽  
Ad Libitum

SUMMARYTwo Poland China boars were mated with 12 Large White females and two Large White boars were used on the same number of females of similar background. In the post-weaning period a trial was conducted to compare the performance of purebred and crossbred progeny given a grower's diet on an ad libitum scale of feeding over the live-weight range 28 to 66 kg. Breed of boar did not influence litter size nor total litter weight at either birth or weaning. Poland China crosses compared with Large Whites grew more slowly to slaughter (10 %) but with equal efficiency of live-weight gain. Cross-breds had higher carcass yields (4 %), shorter (3 %) and deeper (2 %) carcasses, lower depths of mid-line and internal fat (11 %) and larger eye-muscle areas (22%). Breed of boar had little influence on joint proportions and no effect on carcass cut-out value. The eye muscles of crossbred carcasses were paler in colour and had higher transmission values but drip loss from the meat was not different.

scholarly journals Investigation of the associations of SCD gene polymorphism with intramuscular fat content in Duroc and Large White pig breeds

2019 ◽  
Vol 190 (11) ◽  
pp. 35-43
Author(s):  
О. Костюнина ◽  
O. Kostyunina ◽  
Елена Требунских ◽  
Elena Trebunskikh ◽  
Маргарет Форнара ◽  
...  
Keyword(s):  
Live Weight ◽  
Intramuscular Fat ◽  
Test System ◽  
Backfat Thickness ◽  
Large White ◽  
Pig Breeds ◽  
The Difference ◽  
Ultrasound Scanner ◽  
Large White Pig

Abstract. A scientific novelty is the study of the allele pool of domestic reproduction pigs, the determination of population genetic parameters by DNA markers, and the search for associations of genetic variants with economically significant traits. The aim of the work was to study the influence of SCD Y487830 polymorphism: g.2228 T > C to the IMF content and to search for associations of genotypes with economically significant traits in domestic reproduction pigs. The studies were conducted in 2019 on pigs reared in Selection and Hybrid Center LLC (Voronezh region). Genotyping were determined by the QuantStudio™ 5 Real-Time PCR System using the developed test system. The content of IMF (%), backfat thickness (mm), lean (%), live weight (kg) in 103 boars and 27 gilts Duroc pigs, 30 Large White boars was determined using an ExaGo ultrasound scanner. The main diet and animal welfare conditions were identical and corresponded to zoosanitary standards. Model equation for multivariate analysis of variance with interaction was used to evaluate the effect of genotype by SCD on productive qualities. The frequency of the T allele and TT genotype in the group of Duroc pigs was 0.419 and 12.7 %, respectively. Large White pig breeds were characterized by the frequency of the T allele – 0.686, TT genotype – 46.8 %. All Landrace pigs were carriers of the TT genotype. The superiority of the C allele carriers in the content of IMF was shown. The difference between Duroc boars with TT and CC genotypes was 0.42 % (P ≤ 0.05), and individuals with CC genotype exceeded TT genotype carriers in the backfat thickness of more than 3 mm (P ≤ 0.001). The results confirm the association of the SCD genotype with the content of intramuscular fat and the backfat thickness in the Duroc boars.

scholarly journals Missense mutations in exon 2 of the porcine leptin receptor gene and their associations with litter size and body weight

2009 ◽  
Vol 54 (No. 5) ◽  
pp. 210-216 ◽  
Author(s):  
C. Sun ◽  
L. Wang ◽  
D.F. Jiang ◽  
B. Zhang
Keyword(s):  
Litter Size ◽  
Leptin Receptor ◽  
Receptor Gene ◽  
Average Daily Gain ◽  
Live Weight ◽  
Gene Marker ◽  
Missense Mutations ◽  
Production Traits ◽  
Large White ◽  
Exon 2

Leptin receptor (<I>LEPR</I>) gene is regarded as a “candidate-gene” of production traits. The aims of this study were to detect polymorphisms of exon 2 within <I>LEPR</I> gene and to investigate their associations with production traits, litter size and live weight in Luchuan and Large White pig breeds. For this purpose, the single nucleotide polymorphisms (SNPs) of exon 2 within <I>LEPR</I> were detected using the PCR-SSCP procedure and their association with litter size and live weight was also analysed in Luchuan (<I>n</I> = 446) and Large White pigs (<I>n</I> = 405). The results showed that the C155T mutation was found in exon 2 of porcine <I>LEPR</I> gene in analyzed populations, which caused a missense mutation (Met to Thr). The different genotypes of this locus had the effects on total number of piglets born, born alive of the first (1<sup>st</sup>) and the first to the fourth (1<sup>st</sup>–4<sup>th</sup>) litters. The individuals with allele <I>A</I> had a higher number of total piglets born and a higher number of born alive piglets in the first litter (<I>P</I> < 0.05) while the differences in birth weight, weaning weight and average daily gain were not significant among different genotypes of this locus in analyzed populations. It implies that the exon 2 (Thr/Met) mutation of <I>LEPR</I> gene is a potential gene marker of pig reproduction. Therefore, it can be used in the marker-assisted selection (MAS) of pig breeding work.

scholarly journals Meatiness of tested gilts in three consecutive years

2019 ◽  
Vol 35 (2) ◽  
pp. 153-161
Author(s):  
Marija Gogic ◽  
Cedomir Radovic ◽  
Dragan Radojkovic ◽  
Radomir Savic ◽  
Maja Petricevic ◽  
...  
Keyword(s):  
Body Weight ◽  
Performance Test ◽  
Backfat Thickness ◽  
Back Muscle ◽  
Large White ◽  
The Third ◽  
Meat Content ◽  
The Impact ◽  
Daily Gain ◽  
Very High

In the present study, the aim was to determine the impact of the following factors: age, farm, and gilt genotype, as well as the regression impact of body weight at the end of the performance test on the following tested properties: age at the end of the test/final age (FA), lifetime daily gain (LDG), the backfat thickness measured in two places (according to the Main Breeding program for Central Serbia), the depth of the long back muscle (BM) and the estimated lean meat content/meatiness (M). The study included two farms of pigs (farm 1 and farm 2), for three consecutive years (year 1, year 2 and year 3). The number of tested heads per year was 974 (year 1), 1311 (year 2) and 757 (year 3). The tested gilts were of Swedish Landrace, Large White and Duroc breeds. The gilts originated from 97 sires, while the number of daughters per sires ranged from 10 to 100. The results show that the Duroc animals were the oldest (245 days), which had the highest values for both measures of backfat thickness, but the lowest values for meatiness. In the third study year, the lowest average values were determined for the properties of the LDG, BM and M. The female animals from the farm 1 showed less growth/gain and had lower values for the estimated meatiness. As a result of the study, it was established that all included factors had a very high statistically significant influence on the variation of the tested properties (P <0.001), only the genotype of gilts showed a high statistically significant effect on the BM property (P <0.01).

scholarly journals The effective use of Pietren breed at purebred and crossbred selection

2018 ◽  
pp. 38-45
Author(s):  
O. Khmeliova ◽  
R. Stavetska
Keyword(s):  
Litter Size ◽  
Average Daily Gain ◽  
Live Weight ◽  
Control Group ◽  
Large White ◽  
Litter Weight ◽  
White Breed ◽  
Fat Thickness ◽  
Effective Use ◽  
Experimental Group

The article highlights the problem of finding optimal variants of breeding process in a herd of pigs at purebred and crossbred selection. For this purpose, the control and two experimental groups were formed: ♀ Pietrain × ♂ Pietrain (control), ♀ (Pietrain × Large White) × ♂ Large White (first experimental group), ♀ (Pietrain × Durok) × ♂ Pitren (second experimental group). The analysis of the animals performance in these groups was carried out in 40, 30 and 35 parities, respectively. The research was conducted on the basis of PE «Maglevovany M.I.» in the Donetsk region. It has been established that the higher level of reproductive characteristics have sows of first experimental group, which have heredity of Large White breed, this breed is traditionally considered as a maternal form in cross-breeding schemes. For instance, their litter size at birth is higher than the same indicator in the control and second experimental group (plus 0,5, P<0,05, and 0,3 piglets, respectively); by the litter size at weaning at 28 days (plus 1,6, P<0,001, and 0,6 piglets); by the litter size at 2 months (plus 1,6, P<0,001, and 0,4 piglets). The highest piglet survival at the age of 2 months was in the litters, whose ancestor were boars of Pietrain breed (second experimental group) − plus 3,6 and 2,3 %, respectively, compered to purebred piglets of Pietrain breed and the first experimental group. For such complex indexes as the litter weight at weaning and litter weight at 2 months the first experimental group had an advantage of 18,1 kg (P<0,001) and 31,1 kg (P<0,001) over the control group (purebred Pietrain) and 5,4 kg and 7,6 kg − over the second experimental group. However, the average piglet weight of sows of second experimental group both at 28 days and at 2 months are equal to the average piglet weight of the same age of the first experimental group. The piglets, which are descendants of boars of meat breeds Duroc and Pietrain show a tendency to the faster growth even in an early age. The avarage live weight of pigs of the second experimental group at the age of 100 days and 7 months is higher compared to avarage live weight of pigs of the same age of the control and the first experimental groups – plus 8,5–21,7 kg (P<0,01 for the second experimental group) and 4,4–13,5 kg (P<0,001 for the second experimental group), respectively. At the age of 100 days, the maximum average daily gain was obtained in the second experimental group with an advantage of 190 g (P<0,001) compared to control group and 115 g (P<0,001) compared to the first experimental group. It is obvious that hybrids with the faster growth, which were obtained through crossbreeding ♀ (Pietrain × Duroc) × ♂ Pietrain reach a live weight of 100 kg in a shorter period: they need less time needed to reach 100 kg of live weight – 32 days less (P<0,001 ) compared to purebred animals of Pietrain breed (control group) and 18 days less (P<0,001) compared to hybrids ♀ (Pietrain × Large White) × ♂ Large White (the first control group). By such an indicator as the fat thickness the hybrids of the second experimental group dominate by purebred pigs of the same age of the control group (minus 0,2 mm), that characterize the low ability of meat breed for getting fat. The fat thickness of hybrids of the second experimental group was less by 0,9 mm (P<0,001) compared to the pigs of the first experimental group. Thus, in this herd in order to improve the reproductive qualities of sows, it is suggested to use the crossbreeding scheme ♀ (Pietrain × Large White) × ♂ Large White and to improve the fattening qualities of young animals the optimal is scheme of crossbreeding ♀ (Pietrain × Duroc) × ♂ Pietrain. Key words: pigs, Pietrain, Large White, Duroc, purebred and crossbred selection, reproductive and fattening qualities.

The effect of energy intake and mating weight on growth, carcass yield and litter size of female pigs

1977 ◽  
Vol 25 (2) ◽  
pp. 233-245 ◽  
Author(s):  
F. D. DeB. Hovell ◽  
R. M. MacPherson ◽  
R. M. J. Crofts ◽  
K. Pennie
Keyword(s):  
Specific Gravity ◽  
Energy Intake ◽  
Litter Size ◽  
Live Weight ◽  
Carcass Composition ◽  
Backfat Thickness ◽  
Special Effect ◽  
Carcass Yield ◽  
Free Body ◽  
Stimulation Of

SUMMARY1. In a comparative slaughter experiment, 12 female pigs (six at 80 kg and six at 100 kg) were allocated at first oestrus to each of five treatments: Treatment 1, initial slaughter, or Treatments 2, 3 and 4, mated and given 19·5, 25·8 or 32·1 MJ ME/day for the last 100 days of pregnancy, or Treatment 5, not mated (virgin) and given 25·8 MJ ME/day over a similar period. Pigs on Treatments 2, 3, 4 and 5 were given the same amount of protein and were killed about 123 days after first oestrus. Piglets were removed at birth.2. There was no evidence of any special effect of pregnancy in the stimulation of permanent maternal growth. The average live weight, ingesta-free body and carcass gains of the pair-fed, mated and virgin gilts (±SE of difference) were, respectively, 32·3 and 36·9 + 2·8, 27·5 and 27·6 ± 3·4, and 26·0 and 26·7 + 2·1 kg. There were no statistically significant differences between these two treatments in carcass composition, specific gravity or backfat thickness. The mated pigs had lighter livers (P < 0·01) and heavier reproductive tracts (P < 0·05), and lost about 9 kg within a week of parturition.3. Increasing energy intake increased piglet birth weights (P<005) but had no effect on the number of piglets born. The pigs that were initially heavier (100 kg v. 80 kg) had 1·5 more piglets, though this was not statistically significant (P<0·1).4. Although there was no special effect of pregnancy on permanent maternal growth, the conversion of food by the once-mated pig was very efficient if an allowance was made for the food cost of producing the piglets.

Response to within-family selection in a small closed pig herd

1971 ◽  
Vol 13 (2) ◽  
pp. 245-255
Author(s):  
R. M. MacIver
Keyword(s):  
Live Weight ◽  
Selection Method ◽  
Backfat Thickness ◽  
Small Scale ◽  
Control Line ◽  
Family Selection ◽  
Genetic Progress ◽  
Large White ◽  
Control Stock ◽  
Foundation Stock

SUMMARYTwo lines of Large White pigs were selected for increased rate of growth and decreased backfat thickness respectively over five generations. Each line was bred from four boars, each mated to four gilts per generation, these being selected on a within-family basis to minimize inbreeding. Response to selection was measured by direct comparison with contemporary control stock. The control line, originating from the same foundation stock as the selection lines, consisted of 15 groups of one boar and two gilts, mating between groups being designed to reduce the rate of inbreeding.Over three generations the control stock exhibited random variation in the traits measured except rate of daily live-weight gain and backfat thickness ‘K’. The evidence suggests that the time trend in these was mainly, if not entirely, non-genetic in nature.The low rate of progress achieved in both lines is ascribed to the selection method adopted and to losses of potential breeding stock. It is concluded that the success of such a small-scale breeding operation is dependent on achieving optimum husbandry conditions, and even then it cannot achieve the same rate of progress as in larger herds. The necessity of using a control strain to assess genetic progress in experiments of this nature is emphasized.

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