Acta Scientiarum Polonorum Zootechnica

 Volume 18(4), 2019

Review Articles

Hormonal changes in dairy cows during periparturient period 

Anna Kurpińska , Wiesław Skrzypczak

 In Press

Abstract. In the last month of pregnancy and the first weeks of lactation, intensive adaptations processes, both morphological and functional, take place in the cow's body. An organism adapts through changes in the intensity of metabolic processes and the activ­ity of its regulatory mechanisms. Maintaining the homeostasis of an organism in prepartum and postpartum periods is the key condition in health maintaining of the mother and the foetus/calf. This paper presents studies on changes in the levels of progesterone, estrogens, androgens, placental lactogen, relaxin, pregnancy glycoproteins, prostaglandin F2α, cortisol, oxytocin, prolactin, GnRH, LH, FSH, thyroid hormones, insulin and growth hormone, significantly associated with the growth and development of the foetus, preparation of the mammary glands for lactation, and, after parturition, with reproductive system regeneration and prepa­ration for new fertilization and pregnancy.

Evaluation of the effectiveness of the monitoring methods in the aspect of the population and distribution of the brown bear (Ursus arctos) 

Katarzyna Wielgórska, Joanna Gruszczyńska

 In Press

Abstract. Population monitoring is a key element in research in the field of animal ecology and nature conservation. Proper coordination of the monitoring program is necessary, especially in the case of species which are difficult to observe due to their biology and ecology, such as the brown bear (Ursus arctos). This paper discusses several monitoring methods, such as surveys, counting females with cubs, monitoring of dens, tagging and telemetry of individuals, use of camera traps, monitoring of damages caused by bears, mortality monitoring and genetic testing. The combination of several methods, depending on the geographic and economic conditions of the country, allows for their appropriate selection, so that the results obtained are as accurate as possible. In case of the brown bear, monitoring of the population should employ different, complementary methods.

Original Research Articles

Analysis of body type evaluation of different color variants of farmed mink (Mustela vison Sch.) against current evaluation standard 

Dorota Kołodziejczyk, Stanisław Socha

 In Press

Abstract. The aim of the study was to comparatively analyze the body type traits in mink of different color variants, over a period of a few years, compared against the current mink evaluation standard. The mink were managed on mink farms located in northwestern Poland. The analysis covered the years 2011–2018. A statistically significant effect of color variant, year of assessment and farm, on which the license took place, was found. The highest average grades for the type were achieved by the mink in 2014, while the color variant achieving best grades was Standard mink. Sapphire mink attained a similar rating. The variability of the assessment of the mink type, measured by the coefficient of variation, ranged within 24.86–33.99%, depending on the adopted criterion. The mink with grade B were characterized by the highest percentage share among the tested animals. These represented 45% of all mink assessed.

The effect of storage time and temperature on the quality of natural yoghurt 

Małgorzata Jakubowska, Tadeusz Karamucki

 In Press

Abstract. Cooling temperature and storage time have a significant effect on the quality of natural yogurts and their durability in retail. The aim of the study was to perform a physicochemical, microbiological and organoleptic assessment of commercial yogurt, immediately after purchase and during 3 weeks of storage at 2°C and 8°C. The following physicochemical parameters were measured: pH, titratable acidity, color (CIEL a*, b*) and basic chemical composition. The organoleptic assessment included the general appearance and color, consistency, aroma and taste and desirability of yogurt. Microbiological tests have determined the amount of Lactobacillus, Streptococcus, Enterobacteriaceae bacteria, and checked the presence of mold and fungi. We have observed a significant effect of storage time on titratable and active acidity in the tested samples. No statistically significant effect of storage time on color of yogurt was observed. As the storage time increased, the number of yogurt microorganisms was decreasing. The minimum normative total amount of lactic acid bacteria was recorded on the day of purchase and after one week of storage at 8°C. As the storage time and the storage temperature increased, the taste and aroma of yogurt was decreasing significantly.

Comparison of feeding models cows during the dry period and their effect on the incidence of perinatal diseases as well as reproductive and productive traits 

Alina Janocha, Anna Milczarek, Katarzyna Kryszak, Dominik Nowak

 In Press

Abstract. The aim of the study was to evaluate to assess different models of feeding dairy cows during the dry period and their impact on the frequency of perinatal diseases as well as reproductive and production characteristics. The research material was a herd of 67 HF black and white dairy cows with a milk yield of 10,540 kg during 305 lactations. Two cow feeding models based on TMR and PMR systems were used in the study, except that the animals in the experimental period received a feed containing calcium chloride. It was shown, that accurate balancing of feed rations during the dry period reduces the incidence of postpartum disorders. The introduction of a feed containing calcium chloride in the feed ration for cows in the close-up period reduced the occurrence of perinatal diseases, i.e. foetal membrane retention (6.4 vs 33.2%), metritis (3.9 vs 61.3%) and abomasum displacement (2.6 vs 4.4%) and clinical hypocalcemia (2.6 vs 5.9). The use of the PMR system in the close-up period with a gradual increase in the DCAD-negative compound mixture individually proved to be effective in reducing the occurrence of perinatal diseases.

Extensity and intensity of intestinal parasite infections in pigs in different types of farm organization 

Aleksandra Balicka-Ramisz, Jacek Wiśniewski, Olha Stadnytska

 In Press

Abstract. The aim of the study was to compare the intestinal parasite fauna of pigs kept in different production systems. Eggs of four nematode species: Ascaris suum, Oesophagostomum spp. Strongyloides spp. and Trichuris suis as well as Eimeria protozoans were found in fecal samples of the examined pigs. In the farms performing an open production cycle, the percentage of infestation was lower (1.07 to 1.36%) than in the farms with a closed production cycle (13.30 to 20%). Differences were found in the scope of infection intensity with particular intestinal parasites depending on the farming system. The Oesphagostomum spp. was found in the largest number of farms (68.6%). Eimeria was located at the second place (42.9%), followed by Ascaris suum (28.6%), Trichuris suis (21.4%) and Strongyloides spp. (11.4%). Interviews with pig breeders showed that in closed-cycle farms, the deworming procedure was being performed sporadically or only after clear clinical symptoms of a parasitic invasion. Our research has confirmed that the problem of intestinal parasites in pigs is still relevant. In pigs, a preventive program should be introduced, in which a parasitological diagnostics will be an important part.
Acta Sci. Pol. Zootechnica

ISSN 1644-0714; e-ISSN 2300-6145

Financial support by Poland's Ministry of Science and Higher Education under the Support for Scientific Journals programme, contract no. 484/WCN/2019/1

MNiSW (2019): 20 pkt

DOI: 10.21005/asp

License: CC-BY-NC 3.0 PL

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