EurekaMag.com logo
+ Translate

Estimation of lactation yield from incomplete lactation records


, : Estimation of lactation yield from incomplete lactation records. Journal of the Indian Society of Agricultural Statistics 44(3): 216-226

In order to estimate the lactation yield of cattle and buffaloes, daily milk yield is recorded at systematic time intervals during the entire lactation period for a sample of selected animals. It may not always be possible, however, to obtain milk records at every time interval for all the selected animals. Two alternative estimators of average lactation yield under village conditions are suggested.

(PDF 0-2 workdays service)

Accession: 002373283

Submit PDF Full Text: Here


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Related references

Pander, B.L.; Hill, W.G., 1993: Genetic evaluation of lactation yield from test day records on incomplete lactation. Genetic prediction of heifer 305-day lactation yield from complete test day records or from records in progress was investigated. The accuracies of genetic indices to predict breeding value for total yield from all 10 test day records of milk, fat...

Dommerholt, J., 1983: The estimation of a steers breeding value for first lactation yield based on the 100-day lactation records of his daughters

Malossini, F., 1964: Prediction of lactation milk yield from part lactation records, from maximum daily production and from persistency of lactation. For records of 246 lactations of Brown Swiss cattle linear relationships with lactation yields were found for the 1st 180-day and 1st 90-day yields. Significant deviations from linear and quadratic relationships with lactation yields were found fo...

Mocquot, J.C.; Auran, T., 1975: Studies on milk production in cattle. II. Usefulness of part-lactation records for selection. (b) Relation between part-lactation yield, yield on the last day of part-lactation and total yield. Data on 32 540 first lactations were studied, and relationships between the traits studied are presented in graph form. Cumulative part-lactation yield was closely related to total lactation yield. However, yield during the remainder of a lactatio...

Blau, G., 1961: Investigations on the course of the lactation curve. I. Influence of initial yield and lactation number on the shape of lactation curve and lactation yield. II. Relationships between persistency and lactation yield and the influence of length of lactation and month of calving on the shape of the lactation curve.. The 532 lactations, reckoned on a 300-day basis, of 90 Black Pied Lowland, 5 Red Pied Lowland and 6 Spotted Mountain officially recorded cows on 41 farms in Hesse were analysed. The majority of these cows were in favourable environments but the la...

Druet, T.; Jaffrézic, F.; Boichard, D.; Ducrocq, V., 2003: Modeling lactation curves and estimation of genetic parameters for first lactation test-day records of French Holstein cows. Several functions were used to model the fixed part of the lactation curve and genetic parameters of milk test-day records to estimate using French Holstein data. Parametric curves (Legendre polynomials, Ali-Schaeffer curve, Wilmink curve), fixed...

Anonymous, 1978: Estimation of total lactation from part-lactation records. For 139 Chios ewes whose lambs were weaned at 35 days of age, the phenotypic correlation of lactation milk yield with 60- and 90-day yield was 0.70 and 0.75 resp. The regression of lactation yield on weekly, 2-weekly and monthly yields was almost...

Auran, T.; Mocquot, J.C., 1974: Studies on milk production in cattle. II. Usefulness of part lactation records for selection. (a) Critical study of different methods of estimating total yield from part-lactation records. A review.

Auran, T.M.cquot, J., 1974: Studies on milk production in cattle. II. Usefulness of partial lactation records for selection. a. critical study of different methods of estimating total yield from partial lactation records. Annales de genetique et de selection animale: (4) 429-443

Cebeci, Z.; Gursoy, O.; Torun, O., 1994: Utilization of regression models using part lactation records for predicting whole lactation yield in Awassi sheep. Galal, E S E [Editor], Gursoy, O [Editor] EAAP Publication; Strategies for the development of fat-tail sheep in the Near East 74-77