The effects of social exchange between two groups of lactating primiparous heifers on milk production, dominance order, behavior and adrenocortical response

Autor:	Iwao Ito, Aya Nishiwaki, Kazuo Sugawara, Nobumi Hasegawa
Rok vydání:	1997
Předmět:	Animal science Food Animals Herd Dominance order Animal Science and Zoology Biology Milk production
Zdroj:	Applied Animal Behaviour Science. 51:15-27
ISSN:	0168-1591
DOI:	10.1016/s0168-1591(96)01082-9
Popis:	The effects of social disturbance, by management practice, on behavior and performance of lactating heifers in a dairy herd were investigated. Two groups of 51 primiparous heifers in mid-lactation were used. Nearly half of the heifers in each group, including the three highest-ranking (Dm), three middle-ranking (Md) and three lowest-ranking (Sb) animals, were selected by angular dominance value (ADV) and the remaining heifers selected randomly. On Day 0, heifers were exchanged between the two groups. Regrouping prolonged the duration of standing and increased the frequency of shorter bouts of lying (≤ 15 min). At the feed bunk, the feeding of Sb was frequently interrupted by an attack of Dm. The average feeding time of Sb was significantly longer than that of Dm ( P P P P P
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::03ad7506d57c40958d4cd98529d1a1f8 https://doi.org/10.1016/s0168-1591(96)01082-9 Zobrazit plný text záznamu Full Text from ScienceDirect