Effectiveness of the Components of Lactation in Selecting for Milk Production in Hariana Cattle

Estimation of reliable genetic parameters for production traits in a tropical breed of dairy cattle

“…The variability in the production traits and lactation length was very high as evident from the coefficients of variation for their traits, which was more than 50% for first two production traits and more than 40% for the last two traits. The higher variability observed in this study for 305-day and total lactation yields was in agreement with the reports of ALIM (1960, '62), GALUKANDE et al (1962), ACHARYA and LUSH (1968), BALAINE et al (1970), MOULICK et al (1972 and JOHAR and TAYLOR (1973) in different breeds of tropical dairy cattle. The coefficient of variation in their reports ranged from 40 to 75% for first lactation milk yield.…”

“…The genetic parameters thus estimated vary widely depending on the environmental effects for which the data were adjusted. The heritability estimates for lactation milk yield in tropical dairy cattle show a wide variation ranging from 'Publication A-355 of the Institute for Animal Husbandry "Schoonoord" MAHADEVAN et al 1962;ACHARYA and LUSH 1968;BALAINE et al 1970;ACHARYA and NACPAL 1971;KHANNA and BHAT 1971;RONNINGEN et al 1971;MOULICK et al 1972;PRASAD and PRASAD 1972;NAIDU 1973; TOMAR SIVARAJASINGAM and MUKHERJEE 1975;RAO and SUNDARESAN 1979).…”

Effect of Non – Genetic Factors on Production Traits in Deoni Cows

“…This has revealed that AFC not interfering with LP and therefore it provides an scope for selection of animals with low AFC with comparatively optimum LP. Similar results were reported by Balaine et al(1970) in Hariana cattle, Umrikar et al (1990) in Gir cattle, Gaur and Raheja (1996) in Sahiwal cattle and Salunkhe (2007) in Deoni cattle.…”

Influence of environment and heredity on the shape of lactation curves in Sahiwal cows

“…Higher peak yield was generally found to be associated with higher lactation yield and persistency as seen from their positive correlations (Table 6). Similar results were also reported by Sikka (1950), Mahadevan (1951), Smith & Legates (1962), Balaine et al (1970), Sharma (1972) and Madsen (1975). The standard errors of genetic correlations were generally too high to draw any valid conclusions regarding the genetic relationship between different traits.…”

“…On the other hand, the monsoon calvers, though producing the lowest lactation yields, showed the highest persistency as their later stages of lactation coincided with better seasons climatologically (post-monsoon) and fodder availability (winter). These results Johansson & Hansson (1940), Sikka (1950), Mahadavan (1951), Askar et al (1959), Anakawiang (1963), Balaine et al (1970) and Madsen (1975) who reported that the winter calvers were the most persistent. The seasonal effect on lactation yield and peak yield observed in this study was similar to the results obtained by Sikka (1950), Ronningen (1967) and Wood (1970).…”