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Lactation curves of dairy camels in an intensive system [PDF]
Tropical Animal Health and Production, 2012 Weekly milk records of 47 she-camels in a multibreed dairy camel herd were collected for over a period of 5 years. A total of 72 lactation curves were defined, and relationships with parity, calving season, lactation length, milk production level, following lactations, and dam weight were analyzed. Overall mean values were milk yield up to 12 months, 1,
Musaad, Abdelgader +2 more
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Non-parametric lactation curves
Animal Science, 1989ABSTRACTLactation curves are fitted to data as a preliminary to estimating summary statistics. Two widely quoted curves are atbe-ct (Wood, 1967) and a(1 - e-bt) - ct (Cobby and Le Du, 1978), each of which has three parameters. Restriction to either of these curves imposes limitations on the fit to the data and can result in biased estimation of summary
D. A. Elston +2 more
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Characterization of the lactation curve in Murciano-Granadina dairy goats
Small Ruminant Research, 2012 The lactation curve of Murciano-Granadina goats was studied by using records collected between 2004 and 2010 under its Official Dairy Recording program, which includes three milking control programs (Granada, Almeria and Cordoba). A total of 518,557 test-
Cecilio Barba, J M Leon, J V Delgado
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The shape of the lactation curve
The Journal of Agricultural Science, 1923(1) The ratio of the total lactation yield to the maximum yield, divided by the mean ratio (in the particular district) for the month of calving in which the lactation commenced, has been selected to represent the shape of each individual cow's lactation curve, and has been called the shape figure (S.F.).(2) The variation of individual S.F.'s was found
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On fitting curves to lactation data
Animal Science, 1978ABSTRACTThe usual method of fitting the model y = Anb exp(−cn) to lactation data, by a multiple regression of logey on n and logen, can result in an ill-fitting curve. An analysis of the untransformed data provides a better fit but requires more extensive computation and a simple approximation to this procedure is given.
J. M. Cobby, Y. L. P. Le Du
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BSAP Occasional Publication, 1981
An algebraic description of the lactation curve is a useful component of any model of the day-to-day production of lactating animals. Observation and common sense suggest that such a function should rise to a peak early in lactation and decline thereafter but simpler models have been used.
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An algebraic description of the lactation curve is a useful component of any model of the day-to-day production of lactating animals. Observation and common sense suggest that such a function should rise to a peak early in lactation and decline thereafter but simpler models have been used.
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ESTIMATING THE SHAPE OF THE LACTATION CURVE
Canadian Journal of Animal Science, 1976The shape of the lactation curve was estimated utilizing a multiple-trait generalized least squares analysis to calculate constants for average daily milk and fat production within 16 stages of lactation for the Holstein and Jersey breeds. The results agree with recent studies in the United States.
L. R. SCHAEFFER, E. B. BURNSIDE
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Quantification of Lactation Curves for Diagnosis
American Association of Bovine Practitioners Conference Proceedings, 2006Milk production over time (the lactation curve) is both a reflection of the health of a lactating cow and the most important economic measure of her performance. MilkBot™ is a tool to quantify both the shape and magnitude of lactation curves in a consistent and repeatable way.
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A note on lactation curves of crossbred cows
Animal Science, 1984ABSTRACTMilk production data were collected on 8- and 9-year-old Angus × Hereford or Hereford × Angus; Charolais × Angus or Hereford; Jersey × Angus or Hereford; and Simmental × Angus or Hereford cows at days 14, 28, 56, 84, 112, 140, 168 and 196 after parturition.
T. G. Jenkins, C. L. Ferrell
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Critical Evaluation of Seven Lactation Curve Estimation Models
2015A mathematical model of the lactation curve approximation provides summary information about dairy cattle production, which is useful in making management and breeding decisions and in simulating a dairy enterprise. Several nonlinear regression models have been developed during the past decades. Unfortunately, there is no unique algorithm in literature.
Jaroslav Marek +2 more
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