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Effect of genetic factors on the litter size in mink

100%

Rozempolska-Rucinska I., Jezewska G., Zieba G.

Animal Science Papers and Reports. Supplement

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2004

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tom 22

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nr 2

2

DNA polymorphism of introns 1 and 2 of prolactin receptor gene and its association with litter size in goats

88%

Ran D., Jing Y., Ming-Xing C., Gui-Ling C., Tao F., Li F., Zhong-Xiao Z.

Animal Science Papers and Reports

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2011

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tom 29

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nr 4

The prolactin receptor (PRLR) gene was studied as a candidate gene for the high prolificacy of Jining Grey goats. Polymorphisms in intron 1 and intron 2 of PRLR gene were detected in high prolificacy (Jining Grey) and low prolificacy (Boer, Wendeng dairy, Liaoning Cashmere and Beijing) native goats using PCR-SSCP. For intron 1, five genotypes (AA, AH, AK, HH and HK) were identified in Jining Grey goats, and two (AA and AK) in the other four breeds. The Jining Grey does of genotype HH, HK, AH and AK delivered by 0.65, 0.62, 0.59 and 0.57 more kids (P<0.01) than those of genotype AA, respectively. For intron 2, three genotypes (CC, CD and DD) were detected in Boer goats, and two (CC and CD) in the other four breeds. The Jining Grey does of genotype CD delivered by 0.55 (P<0.01) more kids than those of genotype CC.

3

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Mean body weight gains in standard mink depending on the number of kits in a litter

88%

Swiecicka N., Bernacka H., Zawislak J.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

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2016

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tom 55[2]

Mean body weight gains in standard mink depending on the number of kits in a litter. The objective of the study was to determine the effect of litter size from which animals came on their weight at weaning and pre - slaughter, and as a consequence also on their mean daily gains. The study was conducted on a population of 330 mink, divided into groups depending on the size of litter from which they came: I (2–4 kits) – 74 animals (44 ♂, 30♀), II (5–7 kits) – 170 animals (92 ♂, 78♀), III (8–10 kits) – 86 animals (44 ♂, 42♀). We established a significant effect of litter size on body weight at weaning and mean daily gains. Animals from smaller litters were found to have a higher body weight at weaning; whereas higher gains were observed in animals coming from bigger litters. Pre-slaughter body weight was similar in all assessed groups.

4

The effect of litter size on the reproductive performance of sows

88%

Klocek C., Koczanowski J., Nowicki J., Migdal W., Kalinowska B.

Annals of Animal Science. Supplement

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2001

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nr 1

5

Performance of young boars depending on the litter size

75%

Kawecka M., Jacyno E., Matysiak B., Kolodziej-Skalska A., Kamyczek M.

Acta Scientiarum Polonorum. Zootechnica

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2013

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tom 12

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nr 3

The material consisted of 60 hybrid boars, from line 990 (female) and Pietrain breeds (male), divided into two groups depending on the litter size in which they were born and reared - group: 7-10 piglets (average 8.8) per litter; group: 11-17 piglets (average 12.5) per litter. The mean body weight of 21 day of live piglets born and reared in larger litters was significantly (P < 0.05) lower than among boars reared in smaller litters. This difference gradually diminished and at day 63 of life both groups had the same average body weight. In the period from 63 to 180 day of life, the boars from smaller litters had a slightly lower rate of growth (statistically insignificant). Boars reared in larger litters at 180 day of life were on average 3 kg heavier. There were no significant differences in fat thickness, lean meat and testicular volume between the assessed groups of young boars. From boars reared in smaller litters ejaculates had a significantly higher (P < 0.05) sperm concentration and total sperm volume.

6

Factors affecting prolificacy and lambs rearing results in Olkuska sheep population

75%

Drobik W., Martyniuk E.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

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2014

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tom 53

Factors affecting prolificacy and lambs rearing results in Olkuska sheep population. The aim of this study was to evaluate reproductive performance of the growing Olkuska sheep population and to analyse impact of a number of factors on lamb rearing results as well as the length of ewes’ utilisation in the flock. Although reproductive performance of Olkuska sheep is still at a relatively high level, recently a decrease of average prolificacy and the continuously low percentage of lambs reared have been observed. This might be related to the rapid growth of the population in the recent years and rather short flock-life of ewes, on average 3.17 years. The results of this study confirm that the size of the litter had the highest impact on lamb rearing results. Substantial differences in reproductive performance depending on the age of the dam were also observed. Despite of poor rearing of lambs born in large litters, no significant correlation between the average prolificacy of ewes in the flock and the percentage of lambs being reared was observed. The results indicate that a major influence on lamb rearing performance depends upon individual characteristics of a dam, as well as husbandry conditions in the flock and skills of the breeder.

7

Genetic evaluation of litter size traits in Pannon Large rabbits

75%

Nguyen N. T., Farkas J., Szendro Z., Nagy I.

Animal Science Papers and Reports

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2017

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tom 35

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nr 2

Genetic parameters and genetic trends for the number of kits born alive (NBA), number of kits born dead (NBD) and the total number of born kits were estimated in Pannon Large rabbits. Using the REML method 12 single trait models were examined. Heritability estimates were low for all traits and ranged between 0.07-0.08 (with standard errors 0.018-0.021) for NBA (5830 records), 0.01-0.02 (0.009-0.009) for NBD (6278 records) and 0.04-0.05 (0.015-0.018) for TNB (6278 records) from 1469 does. The ratios of the permanent environmental and the phenotypic variances exceeded of the heritability estimates and ranged between 0.11-0.16(0.016-0.018) for NBA, 0.06-0.07 (0.014-0.015) for NBD and 0.11-0.17 (0.014-0.017) for TNB. When characterizing the goodness of models bias values were practically zero for all traits and models. After identifying the best fitted model (containing parity, age of the doe and year-month of kindling effects) it was extended with dominance effects. As a result, heritability estimates decreased to 0.06 (0.028) for NBA, 0.02 (0.012) for NBD and 0.02 (0.022) for TNB. The relative importance of the permanent environmental effects also decreased to 0.09 (0.031) for NBA, 0.05 (0.024) for NBD and 0.07 (0.028) for TNB. Ratios of the dominance effects exceeded those of the heritability estimates and amounted to 0.27 (0.024) for NBA, 0.05 (0.013) for NBD and 0.38 (0.025) for TNB. When compared to the additive model, the model including dominance showed some confounding with additive genetic and with permanent environmental effects and reduced calculated genetics trends (0.035 vs 0.03, -0.0017 vs -0.003 and 0.016 vs 0.01 for NBA, NBD and TNB, respectively). Spearman rank correlation coefficients between breeding values of the additive and dominance models were high for all traits (0.96-0.98). When dominance effects were included some re-ranking was observed among the top ranked animals for every trait.

8

Economic weights for litter size and fur coat traits of Arctic fox in Poland

75%

Wierzbicki H., Peura J., Filistowicz A., Przysiecki P.

Journal of Animal and Feed Sciences

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2007

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tom 16

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nr 1

140-152

9

Mating system vs. litter size in farm mink (Neovison vison) – effect of multiple paternity

75%

Felska-Blaszczyk L., Seremak B., Lawrow N.

Acta Scientiarum Polonorum. Zootechnica

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2019

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tom 18

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nr 2

10

Young chinchillas weight gain, depending on their body mass at birth

75%

Dzierzanowska-Goryn D., Brzozowski M., Goral-Radziszewska K.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

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2014

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tom 53

Young chinchillas weight gain, depending on their body mass at birth. The aim of the study was to determine if the results of raising and growth for up to 4th months of age in chinchilla depends on body weight and the litter size at birth. There were also attempts to answer the question, when sexual dimorphism begins to be visible in young chinchillas. Males are heavier females from the first month of life in chinchilla, however up to the 4th months of age the differences are not statistically significant. During the study it was found, that young chinchillas mortality depends on their body weight at birth. When the body weight at birth is higher, the greater chances of survival of the young are. Number of puppies in the litter affects their body weight: the more young per litter are, the less average body weight is.

11

Sex ratio in litters of domestic pigs [Sus scrofa f.domestica Linnaeus, 1758]

75%

Gorecki M. T.

Biological Letters

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2003

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tom 40

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nr 2

12

A comparison of inbreeding effect on litter size and fur coat traits in Polish and Finnish blue fox populations

75%

Wierzbicki H., Peura J., Zuk B., Stranden I.

Animal Science Papers and Reports. Supplement

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2004

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tom 22

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nr 2

13

Decrease in pig fertility as a result of reciprocal translocations and associated economic effects on the basis of rcp [7;13][q13;q46]

75%

Danielak-Czech B., Kozubska-Sobocinska A., Slota E., Rejduch B., Okularczyk S.

Journal of Applied Genetics

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1996

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tom 37

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nr 4

Reciprocal translocations, very frequently identified in pigs, are the cause of fertitlity decrease. The aim of this work was to provide an objective assessment of the real effect of reciprocal translocation (7;13) on the fertility of carriers and associated economic effects. The experiment has shown that fertility, expressed as a mean litter size, decreased by 48% in comparison to that of the control group. On the basis of simulation account, financial losses incurred a translocation - as a result of using carrying boar in a commercial herd were estimated at about 8,000 USD for natural mating and at about 162,000 USD for artificial insemination. The results obtained show the need for introducing a system for cytogenetic control of boars producing small litters into the Polish swine improvement programme.

14

Body size and reproductive parameters in the wild boar Sus scrofa

75%

Fernandez-Llario P., Mateos-Quesada P.

Acta Theriologica

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1998

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tom 43

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nr 4

Parameters involved in the reproductive performance of wild boar Sus scrofa Linnaeus, 1758, such as fertility rates and litter size, show considerable intrapopu- lational variability. In this work we analyze a total of 198 females, culled by hunting in the Villuercas region (Cáceres, Spain), in an area with food suplementary throughout the year. The 31% of the total number of females examined, and the 47% of the female above 44 kg body weight, were in breeding condition (either gestating or lactating). There were no differences among four central months throughout the breeding period in the proportion of breeding females. Mean litter size was positively influenced by physical features of the female such as body size and weight. The month of the year (within the central breeding period) did not affect litter size. These findings indicate that reproductive decisions of females, ie whether or not to start gestation and the number of offspring in the litter, are mainly determined by their physical features.

15

Molecular characterization, polymorphism and association with reproductive traits of porcine CDK20 gene

63%

Liu Y. G., Xia X. H.

Journal of Animal and Feed Sciences

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2011

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tom 20

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nr 4

16

Extra light during pregnancy improves reproductive performance of mink (Neovison vison)

63%

Felska-Blaszczyk L., Seremak B., Lasota B., Klecha A.

Annals of Animal Science

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2013

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tom 13

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nr 4

17

Selected electrolytes and metabolites in the puerperal ewes with twins and singleton

63%

Valocky I., Mozes S., Lenhardt L., Kacmarik J.

Medycyna Weterynaryjna

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2006

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tom 62

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nr 06

652-654

The object of the experiment was to determine the extent to which selected electrolytes (Na, K, Ca, P) and metabolites (cholesterol, total lipids, and total proteins) changed in the blood serum during the postpartum period in ewes and their correlation to litter size. Blood was collected from the jugularis v. of 149 Slovak merino breed ewes on 1, 4, 7, 14, 17, 21, 25 and 34 postpartum days. Lower Na and K levels were recorded in ewes with twins compared to ewes with a single lamb, with the exception of day 34.When evaluating Ca levels, it was found that the group of ewes with a single lamb exhibited a range from 2.38 ± 0.16 to 2.54 ± 0.26 mmol.l-1 and the group with twins a range from 2.39 ± 0.15 to 2.51 ± 0.19 mmol.l-1 and there was no significant difference. Phosphorus levels in the group of ewes with twins were lower on all observed days than those in the group of ewes with single lambs. Lower cholesterol levels were observed from day 7 of the observed period in ewes with twins compared to ewes with a single lamb. By day 21 of the observed period total lipids exhibited lower values in ewes with twins and the total serum protein levels in ewes with single lambs tended to slightly rise during this time. From day 14 postpartum there was a mild decrease in the total protein levels in the group of ewes with twins. The discussion focused on the effect of litter size on selected biochemical parameters during the postpartum period.

18

Renal regulation of calcium-phosphate metabolism in single- and twin pregnant goats

63%

Michalek K., Ozgo M., Skrzypczak W. F.

Folia Biologica

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2009

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tom 57

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nr 3-4

199-205

19

Biological limits of fecundity in sows - do they exist?

63%

Brussow K.-P., Wahner M., Jaskowski J. M.

Electronic Journal of Polish Agricultural Universities. Series Animal Husbandry

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2011

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tom 14

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nr 3

20

Reproductive efficiency of mink females, selected for weaned litter size after first season of reproduction

63%

Brzozowski M., Glogowski R., Grzeszczak-Pytlak A.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

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2012

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tom 51

The aim of this study was to evaluate the reproduction results of mink females, selected for the number of kits weaned in their first reproductive season. The analysis of the reproductive efficiency in two following years indicates that such criterion of mink females selection was apparently ineffective. Slightly increased litter size in the second year was followed by significant decrease in the third cycle of reproduction.

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