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Effect of selected factors on the reproductive performance of Sokolsky mares participating in the program for genetic resources protection

100%
Kamieniak J.
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2013
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tom 31
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nr 2
2
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The effect of dry period length on the course of milk production of Polish Holstein-Friesian var. Black-and-White cows

84%
Salamonczyk E., Gulinski P.
Acta Scientiarum Polonorum. Zootechnica
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2011
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tom 10
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nr 3
Based on the results of milk performance of lactating cows, 15 659 Black-and-White with varied addition of HF genes was evaluated in the course of lactation milk production depending on the length of the dry period before the full lactations investigated. Breast plotted curves according to selected groups of animals Wood’s model. The average milk yield of ECM, the study population was: 6 573 kg of standard lactation and 7 063 kg in the lactation lasted an average of a full 352 days. It also showed that these cows, calving over the years 1995–2008 were marked by very high persistence of lactation. The average monthly decline in milk production after peak lactation was 3.52% (LPI = 31.7%). Of the four genetic groups rated highest in the persistence of lactation (the lowest rate of LPI) had a cow with the shortest period of the dry, less than 45 days in three groups of genes, Black-and-White animals which, in its genotype from 50.1 to 75% HF, from 75.1 HF to 99.9% and cows Polish Holstein-Friesian (100%).Monthly average daily milk yield decrease in ECM from 1 month of lactation, for these groups of animals ranged from 1.9% to 3.4%.
3
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Reproductive biology and quantity evaluation of the Black-striped pipefish Syngnathus abaster (Eichwald, 1831) in the Zaporozhian Reservoir

84%
Fedonenko O., Marenkov O., Stromenko A., Kolesnik N.
International Letters of Natural Sciences
|
2016
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tom 52
The article presents the results of biology and ecology studies about the black-striped pipefish Syngnathus abaster (Eichwald, 1831) in the Zaporozhian Reservoir. Quantity and biomass of fish fingerlings and yearlings in different parts of the reservoir was determined. For the first time the reproductive indicators of pipefish in Zaporozhian Reservoir were investigated: the timing of spawning, fish fertility analysis, information on the number of embryos in the brood chamber of males were shown.
4

Effect of naked oats used for gilts on the state of their reproductive organs and selected reproductive indicators of sows

59%
Szostak B., Stasiak A., Bakowski M., Kanev D.
Annals of Warsaw University of Life Sciences - SGGW. Animal Science
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2017
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tom 56[2]
Effect of naked oats used for gilts on the state of their reproductive organs and selected reproductive indicators of sows. The study was carried out on 180 Polish Landrace gilts. The animals were assigned to three groups, two experimental and one control, with 60 individuals in each. The gilts were fed complete mixed rations in amounts consistent with the norms given in Swine Feeding Standards (1993).The mixture fed to the experimental groups contained 40% (D1) and 20% (D2) naked oats of the Akt variety. Sexual activity was observed in the gilts during the second and third oestrus. The standing reflex was tested twice a day, in the morning and afternoon, and its duration was determined by timing the positive reaction to a boar, to touch and to mounting. Half of the gilts, selected in equal numbers from the control group and the experimental groups, were slaughtered between days 5 and 10 of the luteal phase of the second or third oestrous cycle. The number of corpora lutea was determined in these gilts. The reproductive organs were evaluated as well, taking into account the weight of the uterus, the length of the uterine horns and the weight of the ovaries. The remaining gilts (90) were mated during the second (45 gilts) and third (45 gilts) oestrus. Then the age at first farrowing, the weaning-to-conception interval between the first and second and the second and third litters, and the length of the farrowing interval between the first and second and the second and third litters were calculated. The highest uterine weight was noted in the gilts from the experimental groups. In both periods the weight of the uterus ranged from 372.8 (D2, mated during the second oestrus) to 398.4 g (D1, mated during the third oestrus). The weight of the ovaries was within the normal range, but significant differences were noted between the experimental and control groups. The highest sexual activity during oestrus (2.4-2.7 pts) in the first, second and third reproductive cycles was observed in the sows that received naked oats in their feed ration. Gilts mated during the second oestrus of the first reproductive cycle had litters earliest, on average at the age of 314.7 days (group D1), compared to 335.3 days in the case of gilts bred in the third oestrus of the first reproductive cycle (group D1). The most beneficial farrowing interval in each reproductive cycle was noted in the groups of sows receiving mixtures containing naked oats.
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