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A detailed evaluation of reproductive usefulness was carried out on 187 bulls (82 Black-and-White bulls, 58 R₁ — 25% hf hybrids and 47 F₁ — 50% hf hybrids). Moreover, the analysis of 3002 (BW-1319, 25% hf — 462, 50% hf — 571, 75% hf — 488 and more than 75% hf — 162) bulls was carried out pertaining to the final evaluation of reproductive usefulness (class A, C, D). The objective of the research was...
Out of 28 days old piglets qualified for fattening there were selected 10 dominant and 10 subordinate animals in which the level of catecholamines and cortisole was tested in the blood of the animals after their joining and later after 3 and 7 days. The studies revealed the appearance of emotional and somatic stress: it was decreasing slowly within 7 days in the dominant group, while in the subordinate...
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