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Wpływ zatruwania królic jonami Pb i Cu na ich rozrodczość

100%

Monkiewicz J. , Jaczewski S. , Pawlina E. , Andrzejak R.

tom 40

nr 05

Płodność krów użytkowanych na obszarach skażonych przez hutę miedzi

100%

Jaczewski S. , Monkiewicz J. , Pawlina E.

1989

tom 31

The analysis concerned 543 intercalving and interpregnancy periods and insemination indices in Lowland Black and White cows utilized between 1973-1980 in seven breeding farms situated in various distances from the copper mill in Głogów. On the basis of pollution maps the breeding farms were divided into 3 zones depending on intensity of emission. The aim of the investigations was to find out whether any differences existed between some chosen indices of fertility in cows kept in an environment polluted with heavy metals. Regardless of the distance of the areas where the cows were utilized from the emission source the fertility indices exceeded the values generally accepted as optimal.

Długość okresów życia i użytkowania oraz przyczyny brakowania krów hodowanych na terenie skażonym przez hutę miedzi

100%

Pawlina E. , Jaczewski S. , Monkiewicz J.

tom 30

1283 cows of black-white lowland breed kept on state farms in the areas of various pollution degree were studied. Three groups of herds were distinguished according to the degree of pollution: the cows following the first lactation, the cows that began their milk production in 1973-80 and culled in 1974-84. The following data were determined for each cow: the age of the first calving, the lenght of performance, life time and life yield. Moreover, the reasons of culling were determined as well. It has been found that in all polluted areas the lenght of life and performance is too short. The cows kept in the most polluted area have the shortest time of performance / 3,16 y/. The cows beginning their milk production in 1977-80 had the shortest life time and performance. In those cows, the age of the first calving tended to increase. The cows kept in the most polluted area had the lowest milk and fat yield /9075 kg and 373,7 kg respectively/. Barrennes was the most frequent reason for culling in all the herds studied.