Genetic and seasonal variations of Trypanosoma theileri and the association of Trypanosoma theileri infection with dairy cattle productivity in Northern Japan

ABSTRACTMean daily milk yield, fat concentration and protein concentration in the milk of 579 303 British Friesian, 6 608 Shorthorn, 27 374 Ayrshire, 19 529 Jersey and 19 760 Guernsey cattle were recorded monthly from August 1978 to July 1979 inclusive, and classified by breed, parity, stage of lactation, and five geographical areas according to the location of the herd. Parameters of the function Y(n) = anbecn were estimated for each breed/parity/area group for yield, fat concentration and protein concentration (b and c describe the shape of the curve, a is a scalar, n the week of lactation and e the base of natural logarithms). Systematic deviations from the function were associated with the season of production, reflecting the spring and summer flush of milk yield. Fat and protein concentrations also exhibited seasonal variations from the underlying curve. After correction for the seasonal fluctuation in production, there was no variation in total yield, fat concentration or protein concentration associated with the month of calving.

Download Full-text

Epidemiology of abomasal nematodes of dairy cattle in Hokkaido, northern Japan.

The Japanese Journal of Veterinary Science ◽

10.1292/jvms1939.52.379 ◽

1990 ◽

Vol 52 (2) ◽

pp. 379-385 ◽

Cited By ~ 3

Author(s):

Shin-ichiro FUKUMOTO ◽

Katsuhiro ETANI ◽

Kumiko TOI ◽

Mitsuaki HANADATE ◽

Mitsuji HIDAKA ◽

...

Keyword(s):

Dairy Cattle ◽

Northern Japan

Download Full-text

Diets of walleye pollock Theragra chalcogramma in the Doto area, northern Japan: ontogenetic and seasonal variations

Marine Ecology Progress Series ◽

10.3354/meps238187 ◽

2002 ◽

Vol 238 ◽

pp. 187-198 ◽

Cited By ~ 52

Author(s):

O Yamamura ◽

S Honda ◽

O Shida ◽

T Hamatsu

Keyword(s):

Seasonal Variations ◽

Walleye Pollock ◽

Theragra Chalcogramma ◽

Walleye Pollock Theragra Chalcogramma ◽

Northern Japan

Download Full-text

Profile of endoparasites in dairy cattle in the microregion of São João del-Rei, state of Minas Gerais, Brazil

Arquivo Brasileiro de Medicina Veterinária e Zootecnia ◽

10.1590/1678-4162-12013 ◽

2021 ◽

Vol 73 (1) ◽

pp. 25-33

Author(s):

R.F. Henriques ◽

F.B. Pereira ◽

J.T. Paiva ◽

M.A. Silva ◽

R.M.P.S. Melo

Keyword(s):

Dairy Cattle ◽

Dairy Cows ◽

Seasonal Variations ◽

Minas Gerais ◽

Parasitic Infections ◽

Parasite Control ◽

Dry Period ◽

The Third ◽

Third Stage ◽

Immediate Analysis

ABSTRACT The present study provides the first evaluation of the endoparasite profile in dairy cattle from the microregion of São João del-Rei, Minas Gerais, Brazil, including seasonal variations in parasitic infections. Fecal samples were collected directly from rectum of 123 dairy cows and 160 calves on 15 farms. These were kept in insulated boxes and sent for immediate analysis. Using eggs per gram of feces (EPG) we found the following prevalences: Strongyloidea 43.5%, Moniezia sp. 7.6% and both Strongyloides sp. and Trichuris spp. 2.2%, in dairy cows. In calves, the prevalence was Strongyloidea 50.9%, Moniezia sp. 5.6% and Strongyloides sp. 1.9%. The third-stage larvae recovered from coprocultures from cows and calves consisted mainly of Cooperia spp., Haemonchus spp. and Ostertagia spp. EPG counts were significantly higher in calves. Regarding seasonality, the EPG counts and prevalence of Moniezia sp. tended to be higher in the dry period, whereas those of Strongyloidea were higher in the rainy season. Evidence suggests that parasite control and prophylaxis were inadequately managed on the farms studied here. The present parasitological profile correlates with those found by other similar studies, indicating that the main problem is still the inadequate management of parasite control and prophylaxis by farmers.

Download Full-text