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RELATIONSHIP OF ESTROUS NON-RETURN RATES TO IN VITRO FERTILIZATION AND ACROSOME REACTION RATES OF FROZEN-THAWED BOVINE SPERM

RELATIONSHIP OF ESTROUS NON-RETURN RATES TO IN VITRO FERTILIZATION AND ACROSOME REACTION RATES OF FROZEN-THAWED BOVINE SPERM
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The effect of seminal plasma alkaline phosphatase, fructose and aspartate-amino-transferase on non-return rate in bulls

, 2013
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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
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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
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Higher non-return rate associated with Mycobacterium avium subspecies paratuberculosis infection at early stage in Holstein dairy cows

Theriogenology, 2009
The effects of infection by Mycobacterium avium paratuberculosis (Map) on dairy cows are poorly documented and quite controversial. This retrospective study aimed at quantifying the variation in non-return to service of Holstein dairy cows according to their Map-infection status.
Marcé, Clara, Beaudeau, François, Bareille, Nathalie, Seegers, Henri, Fourichon, Christine   +4 more
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Fine mapping of a quantitative trait locus on chromosome 9 affecting non‐return rate in Swedish dairy cattle

Journal of Animal Breeding and Genetics, 2007
SummaryWe previously mapped a quantitative trait locus (QTL) affecting the trait non‐return rate at 56 days in heifers to bovine chromosome 9. The purpose of this study was to confirm and refine the position of the QTL by using a denser marker map and fine mapping methods.
M, Holmberg, G, Sahana, L, Andersson-Eklund   +2 more
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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
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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.
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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
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