Biomedical subjects

R M Acharya

Publications and source records attributed to R M Acharya.

12 recordsLinked to original sources

PubMed1982

Genetic and environmental trends of milk production in a closed flock of Beetal goats.

Genetic and environmental trends in first lactation milk yield, first lactation length, milk yield per day of lactation, and milk yield per day of kidding interval were determined from records on 1101 nannies, progeny of 86 sires, and spread over 37 yr. Genetic progress was computed from the regression of production on time with adjustment for deviation from random mating according to age, breeding value of dam, culling, and maternal effects. Genetic trends were positive for milk yield and yield per day of lactation and were 1.05 and 1.02% of their respective flock averages. Genetic trends were negative for lactation length and yield per day of kidding interval and were 1.19 and .43% of their respective flock means.

Animals↗

PubMed1980

Factors affecting lamb survival in crossbred sheep.

Survival from birth to 1 month, 1 month to weaning, weaning to 1 year and birth to 1 year was studied in crosses of native carpet wool breeds (Chokla, Malpura and Jaisalmeri) with Rambouillet. Least-squares analysis of data considering survival as 1 and mortality as 0, showed that the year and season of birth affected survival significantly during all age periods except from birth to 1 month and from 1 month to weaning where season had no significant effect. Sex (studied only for pre-weaning survival), ewe's weight at lambing and birth weight of lamb did not influence survival except that the ewe's weight a significant influence on survival from 1 month to weaning. Genetic groups did not differ significantly. Rambouillet X Malpura F1s had a higher survival rate than the other 2 F1s. There was a non-significant decline in survival with an increase in Rambouillet inheritance, except that 5/8 Rambouillet -3/8 Chola crossbreds had a slightly higher survival rate than Rambouillet X Chokla F1s. Interbreeding F1 and 3/4 crossbreds did not result in any significant decline in survival. The results show that the introduction of exotic fine-wool inheritance up to 50% and interbreeding of halfbreds will not result in any decline in survival.

Age Factors↗

PubMed1980

Breeding for improving wool production.

Genetic groups year and season of shearing, sex and ewe's weight at lambing accounted for a significant proportion of variation in first and second 6-monthly greasy fleece weights of Rambouillet crosses with Chokla, Malpura and Jaisalmeri (F1, F2, 5/8, 3/4 and 3/4 interbreds), except that season did not influence significantly the second 6-monthly greasy fleece weight. Sex was not included in the analysis of the second fleece weight. Comparisons among genetic means showed that: (i) Chokla crosses were superior to the other crosses; (ii) there was a small and non-significant decline in both the greasy fleece weights with an increase in level of Rambouillet inheritance; (iii) interbreeding halfbreds and 3/4 breds resulted in a small and non-significant decline in fleece weight, except in Rambouillet x Chokla crosses for the second 6-monthly clip, where the decline was significant. The results indicate that crossing Indian carpet wool breeds with Rambouillet will improve greasy fleece production. Exotic fine wool inheritance should be stabilised at 50% and further improvement be brought through selection among the halfbreds.

Animals↗

PubMed1975