Neutrophil potential phagocytic capacity (NPPC), measured on 25 AI Canadian Holstein bulls, was investigated for evidence of association with production and type traits, SCC, and survival in dairy cows. Bulls were ranked based on different degrees of NPPC (Uptakes of 0, 1, 2, and 3 or more latex beads), using the solutions coming from an animal model. A total of 42,103 first lactation records, collected from 1985 through 1993 in 2,919 Quebec dairy herds, were used to obtain EBV's for SCC and for log SCC (LogSCC) for 697 sires. Correlations between NPPC measurements and somatic cell EBV's were null. Canadian official ETA's for type traits related with mammary system had a tendency of being positively correlated with higher NPPC and negatively with Uptake-0. Canadian official ETA's for production traits were negatively correlated with higher NPPC and positively with Uptake-0. A total of 17,202 first lactation records of daughters of the 25 AI bulls were used to study the effect of NPPC and log SCC on survival in dairy cows. Survival after first lactation was more closely related to sires' NPPC-EBV's than to LogSCC-EBV.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.22728 |
| Date | January 1995 |
| Creators | Dürr, João Walter |
| Contributors | Monardes, Humberto Gonzalo (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science (Department of Animal Science.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001467871, proquestno: MM05547, Theses scanned by UMI/ProQuest. |
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