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Specificity of the embryonic development of precoce sheep

, : Specificity of the embryonic development of precoce sheep. Sel'skokhozyaistvennaya Biologiya 10(6): 900-904

Until 90 days of gestation embryonic development is intensive. Of the internal organs the liver shows the most rapid growth for the first 60 days. The relative weights of the cranium and pelvis decrease with age; that of tubular bones increases. Relative stability of development by periods is typical for the axial skeleton (neck, breast and loin sections of the spinal cord). There is no significant difference in the development of osseous tissues of skeleton sections between the fetus of the Precoce breed and that of other breeds. During gestation hindlimb muscles growth is more intensive.

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Related references

Kuts, G.A., 1978: Specificity of the embryonic development of Prekos sheep

Kuts, G.; Tkacheva, N.; Voskresenskaia, N., 1975: Specificity of the embryonic development of precocious sheep

Mihnovskii, D.K., 1963: The relation between the development of wool and mutton in Precoce sheep. .. Work carried out at the Experimental Farm Terezino is summarised. Precoce with an av. body weight and high wool yield produced progeny which grew quickly and had good mutton characters; those with a high body weight had slow-growing progeny. Birth...

Kroiter, M.K., 1959: Some characteristics of the growth and development of lambs from a single crossing of Precoce and Kazakh Arkhar-Merino sheep. In 1957 purebred Precoce and Kazakh Arkhar-Merino lambs were compared with their reciprocal crosses and with 2nd generation lambs obtained by using Precoce xK. A. -M. s on K. A. -M. . Birth weight, daily weight gains to weaning, 6 body measurement...

Glembockii, Ja. L., 1945: Selection of Precoce sheep at the state stud sheep farm Kotovskii. THE Precoce breed was first introduced into the U.S.S.R. in 1925. Between 1927 and 1931 86, 000 were imported. Work on selection was begun at Kotovskii in 1933 and a new type was evolved to combine high wool production with high meat production an...

Shatskii, A.D., 1982: Some wool production traits in sheep obtained by reciprocal crossbreeding of Precoce and Romanov sheep. Data were obtained on reciprocal crosses of Romanov and Precoce sheep, evaluated at 6 and 16-17 months of age, taking into account colour (white or black) or amount of spotting, fibre diameter and length, evenness of coat, fleece weight, wool grow...

Pomitun I.A., 1986: Productivity of crossbreeds obtained by crossing powarth and australian corriedale sheep breeds with precoce sheep. The study showed that the crossbreeds Powarth .times. Precoce and Australian Corriedale .times. Precoce had a higher wool productivity and slightly lower live weight and meat productivity than pure-bred sheep. The wool productivity of Precoce may...

Balmont, V.A.; Psenicyi, A.P.; Sencenko, K.P.; Volkov, L.K., 1940: Evolution of a new breed of fine-fleeced sheep of the range type on the basis of crossbreeding Kazakh fat-rumped sheep with Precoce rams. EXPERIMENTAL crossing of Precoce and Kazakh sheep was begun in 1931 at the Kazakhstan Animal Breeding Research Institute. All crossbreds in classes III and IV were culled. From the remainder a selected group of sheep which approximated in type and...

Svinolupov, I.I., 1955: Improving Precoce sheep. At a state farm in the Saratov Province on the borders of Kazakhstan, where the production of the purebred Precoce was low, 2730 Precoce ewes were crossed with Caucasian fine-wooled rams in 1950, and some of the poorer ewes were again crossed with...

Dorosenko, N.Ja., 1968: Precoce sheep in the Ukraine. Imports of Precoces were started in 1945 to restore sheep breeding ruined during the war. Crossing of Precoces with coarse-wooled sheep transported from other Soviet republics resulted in 1948-53 in a meat-wool type with a wool clip of 3.0-3.4 kg....