scholarly journals The effect of year on phenotypic variability of performance traits of boars tested at the central test station

2006 ◽  
Vol 22 (1-2) ◽  
pp. 97-108
Author(s):  
Milan Mijatovic ◽  
Milica Petrovic ◽  
Dragan Radojkovic ◽  
Milovan Pusic
Keyword(s):  
Genetic Parameters ◽  
Performance Test ◽  
Least Squares Method ◽  
Phenotypic Variability ◽  
Average Daily Gain ◽  
Genetic Evaluation ◽  
The Body ◽  
Test Duration ◽  
Production Traits ◽  
Large White

The basic goal of these investigations was to reconsider the hypothesis that year is an important factor which statistically affects phenotypic variability of production traits registered in performance test under conditions of a central test station and make decision to include this effect in models for estimation of phenotypic and genetic parameters which are needed for the genetic evaluation. The investigations were carried out over a seven year period (from 1995 to 2001) in the Station for testing of production capacities of swine at Agricultural Corporation "Beograd" in Padinska Skela. The examinations included a total of 738 tested animals of following breeds: Swedish Landrace, Large White and Hampshire. All three breeds were analyzed together because number of tested boars of Swedish Landrace and Hampshire breed was too small in comparison to the Large White breed. The least squares method was used to test the significance of the effects of year on variability of production traits. Test of significance showed that the year at the start of the test influenced (P<0.001) all feed efficiency traits and all growth traits except test duration and average daily gain. The body composition traits were significantly influenced (P<0.01 and P<0.001) by year except muscle depth. However, it was not expected that the body weight at the start of the test and at the end of the test was influenced (P<0.05 and P<0.001) by year at the start of the test. The weight at the start and at the end of the test must stay within strict limits proposed by the testing rules. These investigations showed that effect of year should be included in the models that are used to estimate of phenotypic and genetic parameters which are needed for the genetic evaluation of boars tested under conditions of the central station.

scholarly journals The effect of sires on fenotypic variability of productive traits of performance tested boars

2005 ◽  
Vol 21 (3-4) ◽  
pp. 69-77 ◽  
Author(s):  
Milan Mijatovic ◽  
Milica Petrovic ◽  
Dragan Radojkovic ◽  
Zivan Jokic
Keyword(s):  
Body Composition ◽  
Feed Efficiency ◽  
Least Squares Method ◽  
Average Daily Gain ◽  
Test Duration ◽  
Production Traits ◽  
Feed Conversion ◽  
Large White ◽  
Meat Content ◽  
Productive Traits

The main objective of this study was to investigate the importance of the sires effect on fenotypic variability of production traits of performance tested boars of Large White, Landrace. and Hampshire breeds of pig. The data used in this study were collected from 738 performance tested young boars at the PKB Pig Testing Station in Padinska Skela, from 1995 to 2001. Analysed traits were initial age (IA), final age (FA), test duration (TD), average daily gain on test (ADG), lifetime ADG (LADG), amount of total consumed feed (TF), feed conversion ratio (FCR), daily feed intake (DPI) and body composition traits taken by ultrasonic equipment PIGLOG 105 (backfat thickness - BF1 and BF2, muscle depth - MD and lean meat content - LM) Data was analysed by fixed models of least squares method. Analysis of variance showed that sires nested within Hampshire breed highly significant influenced all investigated traits. Growth, feed efficiency and body composition traits except muscle depth, were highly significant influenced by sires of Large White breed. All feed efficiency traits and muscle depth were not influenced by sires within Swedish Landrace breed.

scholarly journals Genetic parameters for a joint genetic evaluation of production and reproduction traits in pigs

2011 ◽  
Vol 50 (No. 3) ◽  
pp. 96-103 ◽  
Author(s):  
J. Wolf ◽  
E. Žáková ◽  
E. Groeneveld
Keyword(s):  
Genetic Parameters ◽  
Performance Test ◽  
Average Daily Gain ◽  
Genetic Correlations ◽  
Covariance Structure ◽  
Live Weight ◽  
Genetic Evaluation ◽  
Large White ◽  
Reproduction Traits ◽  
Daily Gain

The covariance structure was estimated by REML for a joint genetic evaluation of production and reproduction traits for Czech Landrace (58 258 records) and Czech Large White (167 161 records) pigs using four-trait animal models. The following traits were analysed: lean mean percentage at the end of the performance test in the field, estimated from ultrasonic measurements unadjusted for live weight (LM), average daily gain in field test (in g/day) calculated as weight at the end of the test divided by age at the end of the test (ADG), number of piglets born alive in parity 1 (NBA1) and number of piglets born alive in parity 2 and subsequent parities (NBA2+). The heritabilities were in the range from 0.30 to 0.37 for LM, from 0.13 to 0.18 for ADG, from 0.09 to 0.13 for NBA1 and from 0.10 to 0.14 for NBA2+, depending on the breed and on the model (herd-year-season random or fixed). Genetic correlations between production and reproduction traits were estimated to be non-zero. Correlations between traits caused by the herd-year-season effect were mostly positive. As a general conclusion, the joint genetic evaluation of production and reproduction traits is recommended. The herd-year-season effect should be preferably considered as random. &nbsp;

The genetic foundation of fitness and reproduction traits in Australian pig populations. 2. Relationships between weaning to conception interval, farrowing interval, stayability, and other common reproduction and production traits.

1996 ◽  
Vol 47 (8) ◽  
pp. 1275 ◽  
Author(s):  
E Tholen ◽  
KL Bunter ◽  
S Hermesch ◽  
HU Graser
Keyword(s):  
Genetic Parameters ◽  
Performance Test ◽  
Genetic Relationships ◽  
Average Daily Gain ◽  
Genetic Correlations ◽  
Data Sets ◽  
Production Traits ◽  
Breeding Programs ◽  
Reproduction Traits ◽  
Daily Gain

Data sets from 2 large Australian piggeries were used to estimate genetic parameters for the traits weaning to conception interval (WCIi-l,i) and farrowing interval (FIi-l,i), number born alive (NBAI), average piglet birthweight (BWi), 21-day litter weight (W21i), and sow stayability (STAYli) recorded for each ith parity, as well as sow average daily gain (ADG) and backfat (BF) recorded at the end of performance test. Over parities and herds, heritabilities for each trait were in the ranges: WCI/FI, 0.0-0.10; NBA, 0.09-0.16; BW, 0.11-0.35; W21, 0.12-0.23; STAYli, 0.02-0.09; ADG, 0.35-0.37; BF, 0.36-0.45. Genetic correlations between NBAl and NBA from later parities were significantly different from 1. In addition, in 1 herd negative genetic correlations (rg = -0.04 to -0.25) were found between sow stayability traits and NBA1, but not NBA recorded in later parities. Stayability was Unfavourably correlated with ADG and BF, and favourably correlated with WCI12. However, WCI12 was unfavourably correlated genetically with BF (rg = -0.24) but uncorrelated with ADG. Antagonistic relationships also existed between NBA and BW, NBA and W21, and BW and STAY. In addition to the traditional traits currently included in pig-breeding programs (e.g. ADG, BF, and NBA), traits such as WCI, BW, and STAY should also be considered as selection criteria to minimise the detrimental effects of antagonistic genetic relationships between traits.

Offspring-sire regressions for production traits of pigs in a West Australian selection herd

1982 ◽  
Vol 22 (115) ◽  
pp. 47
Author(s):  
CA Morris ◽  
BM Goss ◽  
RH Wolskel
Keyword(s):  
Body Weight ◽  
Performance Test ◽  
Average Daily Gain ◽  
Sums Of Squares ◽  
Standard Errors ◽  
Performance Tests ◽  
Production Traits ◽  
Large White ◽  
Heritability Estimates ◽  
Daily Gain

Results from farm performance tests of Landrace and Large White pigs were collected over 14 months in a nucleus herd in Western Australia. They were used to make offspring-sire estimates of heritability for average daily gain and two combined ultrasonic fat depths (CK fat). Pigs were tested at about 85 kg and average daily gain was estimated from birth. Only 60% of records from the offspring of homebred sires were analysed, together with the performance test records from all of these sires. Data were adjusted for breed, and then contemporary deviations were estimated as the deviation of a pig's performance from that of all his contemporaries. The offspring-sire heritability estimates accounted for the effects of breed and sex, with sums of squares then being pooled, giving values of 0.05 � 0.1 6 and 0.57 � 0.15 for average daily gain and CK fat, respectively. Adjustments for body weight increased the estimates to 0.27 and 0.68 but with larger standard errors. These latter heritability estimates were very similar to the paternal half sib estimates. The means of all offspring of homebred and purchased boars indicated no advantage of purchased boars over homebreds in the Landrace breed. However, for Large Whites, the purchased boars were genetically superior in average daily gain and inferior in CK fat (by 2.1 and 0.9 a, respectively, in the performance of progeny). The heritability estimates from this study, applied to group-fed farm-tested pigs, suggest similar results to those from central tests or farm tests in Queensland. However, some attention should be given in tested pigs to variation in final liveweights, and possibly to a start weight at weaning instead of at birth.

scholarly journals Genetic parameters of production and reproduetive traits in on a farm tested Danish Large White and Landrace swine in Greece

2000 ◽  
Vol 43 (3) ◽  
pp. 287-298
Author(s):  
J. Bizelis ◽  
A. Kominakis ◽  
E. Rogdakis ◽  
F. Georgadopoulou
Keyword(s):  
Maximum Likelihood ◽  
Genetic Correlation ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Production Traits ◽  
Likelihood Methods ◽  
Large White ◽  
Reproduction Traits ◽  
Maximum Likelihood Methods ◽  
Genetic And Phenotypic Correlations

Abstract. Production and reproduetive traits in Danish Landrace (LD) and Large White (LW) swine were analysed by restricted maximum likelihood methods to obtain heritabilities as well as genetic and phenotypic correlations. Production traits were: age, backfat thickness (BT), muscle depth (MD) and the ratio BT/MD, adjusted to Standard bodyweight of 85 kg. Reproduction traits were: number of pigs born (NB) and number of pigs weaned (NW) per sow and parity. Heritabilities for age, BT, MD and BT/MD were 0.60, 0.44, 0.51 and 0.42 for LD and 0.36, 0.44, 0.37 and 0.45 for LW, respectively. Genetic correlations between age and BT were −0.22 in LD and – 0.44 in LW. The genetic correlation between age and MD was close to zero in both breeds. Genetic correlation between BT and MD were −0.36 and −0.25 in LD and LW, respectively. Heritabilities for NB were 0.25 in LD and 0.13 in LW while heritabilities for NW were close to zero in both breeds. Genetic correlation between NB and NW was 0.46 and 0.70 in LD and LW, respectively.

scholarly journals Physiological state and productivity of young pigs for probiotic action

2018 ◽  
Vol 20 (92) ◽  
pp. 68-72
Author(s):  
V. V. Voronyak ◽  
K. Y. Leskiv ◽  
V. O. Huberuk
Keyword(s):  
Physiological State ◽  
Average Daily Gain ◽  
The Body ◽  
Economic Losses ◽  
Control Group ◽  
Large White ◽  
Young Pigs ◽  
White Breed ◽  
The Impact ◽  
Experimental Group

Due to the impact of adverse environmental factors, unsatisfactory conditions of pig population, deterioration of food supply, abuse of antibiotics, lack of preventive measures, leads to the development of diseases among pigs, especially young, which leads to a decrease in resistance, body performance, reproduction and reduction of livestock, as well as large economic losses. The use of bacterial preparations from living microorganisms can significantly reduce or even eliminate the use of antibiotics and hormones in the cultivation of healthy animals, to obtain high-quality and safe high-grade products. The aim of the work is to study the effect of probiotic EM – 1 on the physiological state and productivity of young pigs of large white breed. The experiment was conducted on two groups (6 heads each) of animals-analogues, starting from 60 days of age, for 2 months. Animals of the control group received feed produced in the farm. Piglets of the experimental group in addition to the main diet received 5% of feed fermented with em-1. Evaluation of the physiological state and productivity of young pigs was carried out on 60, 90 and 120 days of experience according to the methods adopted in clinical practice. Hygienic, hematological, biochemical, zootechnical and statistical methods of research were used in the performance of the work. The use of probiotic EM-1 in animals of the experimental group led to an increase in hemoglobine concentration by 7.7%, an increase in the number of red blood cells by 13.7%, the total number of leukocytes by 9.52%, and glucose concentration by 11.4%. The advantage of the viability of these pigs for the content of total protein (P < 0.05), γ–globulins by 18.6%, the activity of aminotransferases (AlАT, AsAT; P < 0.05), the average daily gain increased by 12.3% at the end of the experiment. For feeding piglets feed with probiotic EM-1 increased metabolic processes, resistance and productivity of the body, which indicates a higher level of redox reactions in their body.

scholarly journals Sources of variability of growth and body development traits of Simmental bulls in performance test

2015 ◽  
Vol 31 (3) ◽  
pp. 339-348
Author(s):  
M. Lazarevic ◽  
D. Niksic ◽  
V. Pantelic ◽  
N. Stanisic ◽  
N. Delic ◽  
...  
Keyword(s):  
Body Mass ◽  
Performance Test ◽  
Growth Traits ◽  
Statistical Significance ◽  
Average Daily Gain ◽  
Analysis Data ◽  
The Body ◽  
Body Development ◽  
High Level ◽  
Daily Gain

To test the variability of traits of Simmental bulls in performance test, data of the Livestock - Veterinary Centres for Reproduction and Artificial Insemination of Velika Plana and Krnjaca were used. In the analysis, data on 113 performance tested bulls born from 2008 to 2009 were used. The analysis included two sets of characteristics: body development traits and growth traits. The average body mass of calves entering the test was 195.75 kg, while the body mass at the end of the test was 476.50 kg, average daily gain in the test was 1138.69 g. Average values of body development traits measured at the end of the test, with 12 months of age were: height at withers 127.13 cm, chest circumference 179.42 cm, the chest depth 61.19 cm and body length 151.34 cm. The influence of their sires, the year and the Centre on the variability of traits was studied. The effect of age is present at a high level of statistical significance (p<0.01) for all traits that are registered at the end of the test, while the effect of the Centre was present in the variability of body mass at the end of the test, the daily gain in the test and the length of the body. The bulls-sires' influence was demonstrated (p<0.05) on the variability in body mass of calves entering the test.

THE INFLUENCE OF PERFORMANCE TEST DURATION AND SELECTION INTENSITY IN SWINE EVALUATION PROGRAMS

1983 ◽  
Vol 63 (4) ◽  
pp. 741-750
Author(s):  
A. P. SATHER
Keyword(s):  
Performance Test ◽  
Average Daily Gain ◽  
Test Period ◽  
Index Selection ◽  
Test Duration ◽  
Selection Intensity ◽  
Feed Conversion ◽  
Constant Weight ◽  
Level Of Selection ◽  
Record Selection

The problem of optimizing the use of limited test station facilities was considered in terms of varying performance test duration and intensity of selection using part-record genetic parameters for feed conversion ratio (FCR) and average daily gain (ADG). Average backfat (ABF) was limited to the market weight period. Full test duration, based on 396 Lacombe barrows and gilts was 88.5 days with FCR of 2.96, ADG of 0.84 kg/day, and ABF of 19.4 mm at a market weight of 93 kg. Proportions saved (p) of tested animals based on the whole record were 0.10, 0.25 and 0.50. As test station capacity was increased by reducing test duration, p was decreased such that a constant number of animals would be retained within each level of selection intensity. Optimum test period for FCR, ADG and index selection all coincided with the same test period. However, as p increased from 0.10 to 0.50, the optimum on test weight increased from 52 kg to 65 kg with a similar corresponding increase in on-test age from 98 days to 112 days. The test terminated at market weight. Gains in efficiency were 12%, 23% and 50% for index selection when the test period began at 52 kg, for p of 0.10, 0.25 and 0.50, respectively. Since very efficient animals would be near market weight by the on-test age of 98 days, test periods defined in terms of constant weight, rather than constant age, were deemed most suitable. Other limitations to the model and use of part-record selection procedures were discussed. Key words: Swine, part records, performance evaluation, station testing

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.

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