Биологические и сельскохозяйственные науки

An efficient mineral and energy supplement in the rations of highly productive cows

The article discusses the results of scientific and economic experiment carried out on black-motley breed cows on the use of mineral and energy supplement, ‘Reactor’, which includes energy components, calcium propionate, betaine and natural sorbent. The complex action of the investigated product had a positive impact on animal productivity. It was established experimentally that using during the transitional period of 250-350 gr. of ‘Reactor’ per head daily allows to increase daily milk yield of cows in the first hundred days of lactation by 9.8 and 14.5% (to 30.3 and 31.6 kg vs.

The effect of fertilizers on the vital functions of spruce in a blueberry spruce forest

The effect of fertilizers on physiological processes intensity and spruce growth in a 120 year-old blueberry spruce forest of the IVth quality grade has been studied. The study describes the change in the root respiration intensity, photosynthesis, transpiration, concentration of photosynthetic pigments, moisture content of spruce needles and their biometric parameters under the influence of mineral fertilizers (urea, double superphosphate and potassium chloride).

Silvicultural and ecological evaluation of advanced thinning in the Velsk district, Arkhangelsk region

Forest management is carried out in order to increase the productivity and preservation of useful functions of forests by means of felling of trees and bushes, as well as to carry out amelioration and other activities. Continuous logging has great importance in the system of measures on care of the forest. The purpose of these cuttings is to grow highly productive stands of the raw material purpose, to increase the overall forest management. The opportunities for more comprehensive and timely resource utilization are expanding with their help.

The optimum shelf life of chilled turkey meat using different packaging methods

The study is carried out in LLC «Evrodon», October (c) district of Rostov region. It has been found that males at the age of 140 days are larger 1.80 times more than females, 147 days - 1.62, and 154 days - 1.58. Breast weight of males is 5.42 kg, that is 2.19 kg more than in females. Chemical meat composition has been showed that the dry matter in the meat of 147- day- old males is by 0.86% higher compared with 140 -day-old ones; the dry matter in the meat of 154- day-old males is by 0.33% higher compared to 147- day-old ones. The index in females is 0.5% and 0.6% respectively.

Local monitoring of environment in the conditions of the Vologda region

The article presents the results of local monitoring on the territory of the Vologda region for the period from 1995 to 2017. It is established that the main objective of local monitoring is the monitoring of soil, plants and water, and assessment of changes in time and space

Influence of the season on the mass fraction of protein and urea in the milk of cows of black and motley breeds with different methods of maintenance and milking technologies

The article presents the results of studies on the urea content and the mass fraction of protein in the milk of cows with a tethered and loose method of maintenance, taking into account the technology of milking cows, depending on the season. The optimum content of urea, protein in cow’s milk is established in summer period, the greatest one is revealed in winter period with all milking methods and maintenance technologies

Effect of different milk production technology on milk yield of cows and somatic cell maintenance

The article provides the information on the results of the study of quantitative and qualitative indicators of milk and somatic cells based on the method of keeping and cows’ milking technology. The influence of the technology of the milk yield on the somatic cells maintenance is established.

The impact of variability of the type of Siberian cedar by seed scale apophysis on the seed peel firmness

The seed peel firmness of Siberian cedar morphological forms (by seed scale apophysis) has been studies. The existence of differences on the seed peel firmness indicators between the forms is theoretically based by the nutcracker’s activity. The results of the experiments prove the given assumption. It is shown that nuts from the cones with plain apophysis type require the relatively less maximum power and tension, but more time on their cracking. To use the seeds of the given morphological trees’ forms is prospective for the production of cedar kernel.

Influence of thinning out and nitrogen fertilizers on photosynthesis and growth of spruce in birch forests of myrtillus type

The effect of different nitrogen doses and cutting on the rate of physiological and growth processes has been studied in birch forests of blueberry type in taiga zone. It has been established that nitrogen has got little effect on the vitality and growth of spruce in mature birch forests because of the light lack. In thinned stands the nitrogen increases the rate of photosynthesis twofold, activates processes associated with the accumulation and subsequent outflow of carbon metabolites from the needles. The result of this nitrogen action is the intensification of growth processes.

Specific measures to prevent helminthiasis in cattle in the Russian North-West non-black soil zone

The general measures of specific prevention of pasturable helmints in cattle based on the rich experience of personal experiments taking into account the species composition, ecology, epizootiology, biology of helmints are presented.

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