Results 261 to 270 of about 2,765,137 (305)

Validation of non-return rate as a parameter for stallion fertility

Livestock Production Science, 1999
Abstract The non-return rate is evaluated as a parameter for assessment of reproductive performance of stallions. This parameter gives the percentage of mares that did not return (NR) for breeding within a specific time after last insemination. Breeding data were recorded in a computerised registration system, from six studfarms on 18 Dutch Warmblood,
van Buiten, A., van den Broek, J., Schukken, Y.H., Colenbrander, B.A.   +3 more
openaire   +4 more sources

Detection of quantitative trait loci affecting non‐return rate in French dairy cattle

Journal of Animal Breeding and Genetics, 2008
SummaryThe purpose of this study was to map quantitative trait loci (QTL) influencing female fertility estimated by non‐return rate (NRR) in the French dairy cattle breeds Prim’Holstein, Normande and Montbeliarde. The first step was a QTL detection study on NRR at 281 days after artificial insemination on 78 half‐sib families including 4993 progeny ...
Ben Jemaa, S., Fritz, S., Guillaum, F., Druet, Tom, Denis, C., Eggen, A., Gautier, M.   +6 more
openaire   +5 more sources

Uniqueness of non-negative internal rate of return

Journal of the Institute of Actuaries, 1982
We will be considering a productive investment project or financial security which yields a sequence of cash flows, positive or negative, over time. Let a1 (dollars) be the cash flow from the project at time t, where t takes the values 0, 1, 2,…, n. Given the known cash flows at from the project, and a known market rate of interest, i per period, at ...
Allen M. Russell, John A. Rickard
openaire   +1 more source

PREGNANCY RATES AND NON‐RETURN RATES FOLLOWING ARTIFICIAL AND NATURAL BREEDING IN DAIRY HERDS

Australian Veterinary Journal, 1978
SUMMARY Information routinely supplied during the conduct of a dairy herd health program was analysed to evaluate the performance of artificial breeding in Victoria. A comparison was made between 60 to 90‐day non‐return rates (supplied by artificial breeding centres) and pregnancy rates (determined by manual pregnancy diagnosis) for first artificial ...
N B, Williamson, R S, Morris, G A, Anderson   +2 more
openaire   +2 more sources

Adjustment of non-return rates for AI technicians and dairy bulls

Livestock Production Science, 1987
Abstract Insemination results of technicians and dairy bulls in AI were studied using 87112 first inseminations from 283 bulls by 37 technicians. The traits studied were 28- and 56-day non-return rates. Models were compared on the basis of the correlation between solutions obtained from a reference model and reduced models.
Jansen, J., Lagerweij, G.W.
openaire   +1 more source

Conditional Leptokurtosis and Non-Linear Dependence in Exchange Rate Returns

Journal of Policy Modeling, 1998
Abstract This paper analyzes exchange rate returns for five currencies (Danish krone, Dutch guilder, French franc, Swiss franc, and U.S. dollar). As in Caporale and Pittis (1994) , and unlike most of the empirical literature on exchange rates including Pesaran and Robinson (1993) , we take a parametric approach to modeling exchange rate dynamics ...
Caporale, Guglielmo Maria, Hassapis, Christis, Pittis, Nikitas, Caporale, Guglielmo Maria, Hassapis, Christis, Pittis, Nikitas   +5 more
openaire   +2 more sources

Modelling Exchange Rate Returns Using Non-linear Models

Margin: The Journal of Applied Economic Research, 2010
Forecasting exchange rate movements is challenging, as they exhibit high volatility, complexity and noise. Most traditional models cannot forecast exchange rates, with significantly higher accuracy, than a random walk model. In this study, a non-linear model called artificial neural network (ANN) is used to forecast short-term (daily and weekly ...
openaire   +1 more source

Effects of AI sires and technicians on non-return rates in the Netherlands

Livestock Production Science, 1990
Abstract Fertility of AI bulls is evaluated by non-return (NR) rates. Usually these NR rates are calculated as averages, uncorrected for effects of environments. An NR rate (0,1) is measured on the cow, but is affected by the bull and by the technician who carried out the insemination.
Reurink, A., den Daas, J.H.G., Wilmink, J.B.M.   +2 more
openaire   +1 more source

OBSERVATIONS OF THE FIRST SERVICE NON‐RETURN RATES OF THE HYPOGLYCAEMIC, CONCENTRATE‐FED DAIRY HERDS

Australian Veterinary Journal, 1978
SUMMARY Fourteen dairy herds which had been subjected to the Compton Metabolic Profile test on a total of 29 occasions were selected from the records of the Institute for Research on Animal Diseases, United Kingdom, because they had a wide range of mean blood‐glucose concentrations.
T J, McClure, J M, Payne
openaire   +2 more sources