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Level of reproduction traits of ewes in blackhead sheep and growth of their offspring

100%
Szewczuk M., Lachowski W., Zurawski G., Chocilowicz E., Czerniawska-Piatkowska E.
Acta Scientiarum Polonorum. Zootechnica
|
2011
|
tom 10
|
nr 2
The investigations were carried out in a sheepfold located in the Pomeranian Province, Poland. Sheep were evaluated in terms of reproduction traits of ewes, nursing success, and the weight at birth of their lambs. The herd achieved a generally high level of reproduction traits, similar to reference values for the breed published by the Polish Sheep BreedingAssociation for the years 2005–2009. The mean fertility index for the studied period remained at a level 78.2%, prolificacy 133.8%, and lamb nursing success 86.8%, whereas the mean index of reproduction performance was 90.8%. Equally high values were observed for the growth of the offspring. Until 75 days of age, both body weight and daily gains of singles were higher compared to those of lambs born from multiple births. The ram lambs attained higher body weight and daily gains as compared to the ewe lambs of the same age.
2

The effect of inbreeding on reproduction and production traits in mink

100%
Berg P.
Zeszyty Naukowe. Przegląd Hodowlany
|
1996
|
tom 27
3

The effects of polymorphisms in DGAT1, GH and GHR genes on reproduction and production traits in Jersey cows

84%
Komisarek J., Michalak A., Walendowska A.
Animal Science Papers and Reports
|
2011
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tom 29
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nr 1
The aim of the study was to examine the impact of four single nucleotide polymorphisms in DGAT1, GH and GHR genes on reproduction, production and udder health in Jersey cattle. The study was conducted on 209 cows from the Polish active dairy population and genotypes were identified using the PCR-RFLP technique. The significant effects on certain of analysed traits were revealed of GHL127V and GHR-F279Y polymorphisms. Replacement of the phenylalanine encoding T allele by the tyrosine encoding A variant at GHR-F279Y locus led to decrease in milk, fat and protein yields. The GH-L127V-CC genotype was found to be significantly associated with the shorter calving interval and shorter interval from calving to conception than the other two GH genotypes. No relations were found between DGAT1-K232A mutation and health or reproductive traits of cows.
4

Selection for reproduction traits in Hungarian pig breeding in a two-way cross

84%
Nagyne-Kiszlinger H., Farkas J., Kover G., Nagy I.
Animal Science Papers and Reports
|
2013
|
tom 31
|
nr 4
The authors analysed reproduction traits in the Hungarian Large White (HLW) and Hungarian Landrace (HL) breeds and their reciprocal crosses (F1) based on the data collected within a field test between 2001 and 2010. The traits were number of piglets born alive (NBA), gestation length (GL),farrowing interval (FI) and age at first insemination (AFI). Genetic parameters were estimated separately for purebreds and crossbreds by the REML method applying two-trait repeatability models for NBA, GL, FI, and two-trait single measurement model for AFI. Records of purebred and crossbred pigs were considered separate traits. The numbers of sows for NBA and GL were 56743-167865, for FI 38541-112059, and for AFI 16083-46143. Total number of animals in the pedigree amounted to 126340. AFI was of moderate heritability with large difference between purebreds and crossbreds: 0.28 for HLW, 0.26 for HL vs. 0.40 for the HLW/HLWxHL, and 0.41 for the HL/HLWxHL crosses. Heritability estimates for GL, both in purebreds and crossbreds were moderate:0.30 for HLW, 0.22 for HL, 0.25 for the HLW/HLWxHL cross, and 0.25 for the HL/HLWxHL cross.Heritability coefficients of NBA were low at 0.09, 0.06, 0.07, 0.06, and of FI at 0.06 for all HWL, HL,and their crosses, respectively. Magnitudes of the permanent environment effects ranged between 0.04-0.07 for GL and NBA and were null for FI. Genetic correlation estimates between purebred and crossbred performances were 0.28 and 0.39 for AFI, 0.96 and 0.82 for GL, 0.82 and 0.93 for NBA,as well as 0.65 and 0.33 for FI. Selection of purebred pigs for AFI and FI crossbred performances can be based on the crossbred breeding value whereas selection for NBA and GL can use either breeding value.
5

The effect of the polymorphism of leptin [LEP], leptin receptor [LEPR] and osteopontin [OPN] genes on selected reproduction traits of synthetic Line 990 sows

84%
Korwin-Kossakowska A., Kamyczek M., Cieslak D., Pierzchala M., Kuryl J.
Animal Science Papers and Reports
|
2002
|
tom 20
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nr 3
6

Preliminary study of the RBP4, EGF and PTGS2 genes polymorphism in pigs and its association with reproduction traits of sows

84%
Korwin-Kossakowska A., Kapelanski W., Bocian M., Kamyczek M., Sender G.
Animal Science Papers and Reports
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2005
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tom 23
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nr 2
Genes of retinol-binding protein 4 (RBP4), epidermal growth factor (EGF) and prostaglandin-endoperoxide synthase 2 (PTGS2) were examined as candidate genes for reproductive traits in sows. The material included a total of 300 sows of the Polish Landrace (n=86), Polish Large White (n=64)and commercial Line 990 (n=150). Included in the study was the total number of piglets born (TNB),number of piglets born alive (NBA), number of piglets on day 21 of age (NP21), number of piglets weaned (NPW), litter weight on day 21 of age (LW21), litter weight at weaning. (LWW) and farrowing interval (FI). Calculations were based on records available for two farrowings (1st and 2nd) from each sow.The RBP4 genotype was found to have a significant effect on LW21 and LWW (P≤0.05 and P≤0.01,respectively). No significant effect of this genotype was identified for litter size traits (TNB, NBA).The effect of EGF genotype was found significant on TNB (P≤0.01) and NBA (P≤0.05). The A/A animals showed the highest reproductive efficiency compared to those of B/B and A/B genotypes.No significant effects of the PTGS2 genotype were found due to a total absence of one of the homozygous genotypes at this locus.
7

Genetic evaluation of production and reproduction traits in two selected lines of geese under multitrait animal model

84%
Wolc A., Barczak E., Wezyk S., Badowski J., Bielinska H., Szwaczkowski T.
Animal Science Papers and Reports
|
2008
|
tom 26
|
nr 1
Heritability of and genetic correlations among production and reproduction traits as well as genetic trends over eight years of selection were estimated in W11 (maternal) and W33 (paternal) lines of geese. Considered was body weight on week 8 (BW8) and week 11 (BW11), number of eggs produced (EP), egg weight (EW), percentage of fertility (PFE), and percentage of hatchability from eggs fertilized (PHC). Multitrait animal model was applied. Moderate to high heritability estimates were obtained for BW8, BW11 and EP in both lines while lower for PFE and PHC. Highest genetic correlations were estimated between PFE and PHC and between the body weight traits. No clear genetic trends for any trait were identified. Generally, unfavourable relationships between productive and reproductive traits have been confirmed.
8

Genetic and environmental factors of raccoon dog reproduction traits

84%
Slaska B.
Electronic Journal of Polish Agricultural Universities. Series Animal Husbandry
|
2002
|
tom 05
|
nr 2
The aim of the studies was to analyse reproduction of raccoon dog females, estimation of genetic and environmental variability parameters of prolificacy and other reproduction-related traits. The material for the study was represented by data obtained from breeding documentation of a fur-animal breeding farm in the Wielkopolskie Province. The data were on raccoon dogs bred during 1997-1999. The observations covered 1165 females of the breeding stock, which had given birth and their offspring had been weaned. The results of the reproduction of the females were presented in relation to: year of an observation, age of females, litter size of their origin, colour type, date of heat appearance, gestation length, and whelping date. The restricted maximum likelihood method (REML) was applied for the estimation of genetic and phenotypic reproductive traits.
9

Effect of two dietary protein levels on testosterone, testicular parameters and semen quality in ram lambs during pubertal development

67%
Elmaz O., Cirit U., Keser O., Gurbulak K., Guvenc K., Kutay C.
Medycyna Weterynaryjna
|
2007
|
tom 63
|
nr 10
1177-1180
The aim of this study was to determine the effects of two dietary protein levels on testosterone, testicular parameters and semen quality in Kivircik ram lambs during pubertal development. Two experimental groups were formed. Following weaning, crude protein (CP) and metabolic energy (ME) levels were 12% CP, 2.54 Mcal/kg in group I (low protein diet) and 18% CP, 2.52 Mcal/kg in group II (high protein diet). Measurements of live weight and testicular characteristics and collection of blood samples for testosterone hormone concentrations were performed at 20 day intervals starting from 115-days- up to 195-days-of-age. There was an increase in semen volume, spermatozoa concentration and the percentage of progressively motile sperm in both groups between 135 and 195 days of age. Group I had significantly higher semen volume on day 175 (P < 0.05). Furthermore, spermatozoa concentrations were higher in group I than those in group II on days 155 and 175 (P < 0.05). Values of live weight, testicular diameter, testicular circumference, testicular length and testicular volume of ram lambs in group II (high protein diet) were higher than those in group I (low protein diet). Testicular length and testicular volume of group II were significantly higher than those of group I on day 195 (P < 0.05). Despite the fact that group II had an alternating testosterone hormone concentration, it was determined that Group II had better testosterone hormone concentration values than group I on day 115, 135 and 175. However, group I had a higher testosterone hormone level on day 155 and 195. Live weight and testicular characteristics of ram lambs fed with a high protein diet were affected positively during pubertal development. However, it was observed that feeding with a high protein diet had a negative effect on semen characteristics by impairing the thermoregulation mechanism and spermatogenesis in testicles because of excessive fat accumulation in the scrotum.
10

Associations between the microsatellite DNA sequence in the IGF1 gene, polymorphism in the ESR gene and selected reproduction traits in F1 [Zlotnicka Spotted x Polish Large White] sows

67%
Korwin-Kossakowska A., Sender G., Kuryl J.
Animal Science Papers and Reports
|
2004
|
tom 22
|
nr 2
In 53 F1 sows (Zlotnicka Spotted boars × Polish Large White sows) the insulin-like growth factor 1 (IGF1) and estrogen receptor (ESR) genes were assessed as candidate genes for total number of piglets born (TNB), number of piglets born alive (NBA), litter weight at birth (LWB), litter weight at weaning (LWW), number of piglets weaned (NPW), average piglet weight at weaning (AWW) and gestation length (GL). The IGF1 locus genotype (microsatellite sequence) was found to affect (P≤0.01) the TNB, NBA and GL when based on analysis of sows with all litters born. No association between reproductive traits and ESR genotype was found in any restrictive site. However,interesting appeared the results of the analysis including an interaction between ESR genotypem in three polymorphic sites where almost all traits investigated appeared associated (P≤0.05) with ESR genotype. However, due to the limited number of animals, conclusions on the relationship between gene polymor-phisms and reproduction traits must be considered as preliminary, and thus treated with care.
11

Unstable chromosomal regions in subfertile farm animals

67%
Danielak-Czech B., Slota E.
Annals of Animal Science
|
2002
|
tom 02
|
nr 2
12

Analiza cech reprodukcyjnych lisow polarnych w zaleznosci od wieku samicy i typu krzywej opornosci sluzu pochwowego

59%
Kubacki P., Smektala I., Kubacki S.
Acta Scientiarum Polonorum. Zootechnica
|
2005
|
tom 04
|
nr 2
67-76
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