Results 211 to 220 of about 464,037 (262)

The effect of seminal plasma alkaline phosphatase, fructose and aspartate-amino-transferase on non-return rate in bulls

, 2013
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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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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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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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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
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Relationship between non-return rate and chromatin condensation of deep frozen bull spermatozoa

Theriogenology, 2005
This study analyzes the relationship between chromatin condensation and field fertility, expressed as 90 days non-return rate (NRR), of bulls actively used by AI studs. Frozen-thawed semen from five bulls (six ejaculates per bull, three straws per ejaculate), that showed a non-return rate between 60 and 80%, were analyzed to assess sperm chromatin ...
Madrid-Bury, N., Pérez-Gutiérrez, J. F., Pérez Garnelo, Sonia Salome, Moreira, Pedro Nuno, Pintado, Belén, Gutiérrez-Adán, Alfonso, De la Fuente, Julio   +6 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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Investigating the genetic architecture of conception and non-return rates in Holstein cattle under heat stress conditions

Tropical Animal Health and Production, 2019
This study aimed to investigate the genetic variability of conception rate (CR) and non-return rate (NR) in Iranian dairy cows under heat stress conditions. A total of 34,304 records of CR, and NR at 45 days (NR45) and 90 days (NR90) after the first insemination, from 21,405 Holstein cows were included in this study.
Ansari-Mahyari, Saeid, Ojali, Mohammad Reza, Forutan, Mehrnush, Riasi, Ahmad, Brito, Luiz F.   +4 more
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Comparison on models for genetic evaluation of non-return rate and success in first insemination of the Danish Holstein cows

Livestock Science, 2010
Abstract The aim of is study was to compare a linear Gaussian model with logit model and probit model for genetic evaluation of non-return rate within 56 d after first-insemination (NRR56) and success in first insemination (SFI). The whole dataset used in the analysis contained 471,742 records from the first lactation of the Danish Holstein cows ...
Sun, C, Su, G
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