Body and skeleton growth in laboratory field voles of different seasonal generations

Differentiation of seasonal generations of field voles on bone adhesion lines

“…The results presented above, and also the results of earlier studies, show that laboratory breeding without standardized illumination programme, food and humidity, permits of maintaining differentiation in rate of growth and development of the rodents depending on the season of their birth (Fedyk, 1974a(Fedyk, , 1974bKlevezal et al, 1984). The differences we found in structure and rate of formation of adhesion lines in the mandibular bone may therefore give a good picture of the differentiation existing in nature.…”

“…104 of these animals were born during the period, between 28th March and 30th April 1980 and 1982 (spring generation), and 87 animals in autumn between 4th August and 19th September 1980 and 1981. Detailed data on breeding of these animals and a description of material are to be found in the previous study made on the same material (Klevezal et al, 1984). , The field voles were killed at the age of 1.5 to 13 months.…”