C. de S. Lucci, H. J. Sartini, J. do P. Sobral, O. Rehfeld.
Observações sobre hábitos de vacas leiteiras, em pastos de capim fino (brachiaria mutica) e de capim napier (Pennisetum purpureum) I.
observações do comportamento apresentado por 16 vacas mestiças, em lactação,
durante 72 horas consecutivas interrompidas pelas ordenhas, em pastos de capim
fino e de Napier.Os tempos de pastejo
obtidos mostraram-se iguais para as duas gramíneas (7 h, 24 mm por período de 24 h) e
independentes das produçoes de leite, ocorrendo em sua maior parte (72%)
durante o dia (das 5 h as 18 li, 55
mm).O ato de pastejar foi
mais intenso: a) entre 8 e 10 h; b) entre 15 e 19 h; c) por volta das 23 h e,
logo após, entre 1 e 2 h; d) depois do alvorecer, mas nêste instante os animais
foram conduzidos ao estábulo para serem ordenhados.
(Observations of the behaviour of dairy cows, in pastures of Pará Grass (Brachiaria mutica) and of Elephant Grass (Pennisetum purpureum) 1.
Sixteen crossbred cows early in lactation were
divided into blocks by production and at random to pastures of Pará grass
(Brachiaria mutica) and Elephant grass (Pennisetum purpureum).Observations of their behaviour were conducted
for 72 hours, making notations about each animal every 5 minutes. These records
were interrupted by milking. Observers were unable to distinguish if animals
were ruminating at night, so this data is missing. Because of this, only the
grazing times were analized on a 24 hour basis. Such data could be accepted with
confidence, and they are the most important.Grazing times for the two grasses were not
statistically differents; blocks of cows with different productions were not
different, also. The correlation coefficent between grazing times and milk
production was r — 0,417, which was not significant at 5% level.About 72% of the grazing time ocurred in the
day, as the average for both the grasses, and the total hours of grazing were 7
h, 24 m.The periods of more intense grazing were: a)
between 8 and 10 a.m.;
b) between 3 and 7 p.m.; c) about 11 p.m. and again between 1 and 2 a.m.; and d) about sunrise,
but this latter grazing period was interrupted by morning milking.The cows were lying down and excreted feces and
urine more at night; they grazed and drank water more during the day; they walked
about and were standing an equal amount of time, day and night.