geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Multiphasic analysis of reproductive efficiency of dairy bulls


, : Multiphasic analysis of reproductive efficiency of dairy bulls. Journal of Dairy Science 78(12): 2871-2876

Reproductive efficiency of dairy bulls is usually measured by nonreturn rate. Nonreturn is a compound trait that is a result of two events, conception and gestation, that lead to calving. Nonreturn rates can be used to derive more elementary biological measures for reproductive efficiency, such as conception rate and calving rate, which separately might be more reliable than nonreturn rate itself to evaluate the fertility of a bull or the performance of an AI technician. The challenge of this study was to examine the decline in nonreturn rate in light of the theory of multiphasic analysis. A multiphasic logistic function was developed to model decline in nonreturn rate by estimating conception rate, calving rate, and characteristics of the first two estrous cycles. The model is illustrated with data on daily nonreturn rates to 120 d. From the proportion of cows that conceived but failed to complete gestation because of postsignal embryonic death, the model estimates conception rate and calving rate. From the proportion of cows that failed to conceive or that conceived but failed to complete gestation because of presignal embryonic death, the model estimates the proportion of returns, or probability of detecting estrus, duration of nonreturns, and time of maximum decline in nonreturn rate for the first two cycles. Using the proposed model, conception rate and calving rate estimated from daily nonreturn rates might be more reliable for evaluation of performance of an AI technician and fertility of a bull than nonreturn rates at arbitrarily chosen days after insemination.

US$19.90

PMID: 8675769

DOI: 10.3168/jds.S0022-0302(95)76917-X


Other references

Neuhäuser, G., 1973: Differential diagnosis of intracranial pressure increase in the child. Medizinische Monatsschrift 27(8): 340-351

Bubarova M., 1980: Electrophoretic study of soluble proteins in new plant forms resulting from remote hybridization of apium graveolens and petroselinum hortense acid proteins. Electrophoresis of acid proteins on polyacrylamide gel was used to assess the genetic relationship between the hybrids and their initial parental forms. Regularities of the inheritance of acid proteins were observed. Following remote hybridization...

Halaban, R.; Rubin, J.S.; White, W., 1993: met and HGF-SF in normal melanocytes and melanoma cells. HGF-SF stimulates the proliferation of normal human melanocytes in the presence of synergistic factors, one of which is bFGF, and promotes motility and expression of high levels of tyrosinase activity and melanin content. Melanocytes from a recurr...

Shimizu, Y.; Ohishi, K.; Suzuki, R.; Tajima, Y.; Yamada, T.; Kakizoe, Y.; Bando, T.; Fujise, Y.; Taru, H.; Murayama, T.; Maruyama, T., 2014: Amino acid sequence variations of signaling lymphocyte activation molecule and mortality caused by morbillivirus infection in cetaceans. Morbillivirus infection is a severe threat to marine mammals. Mass die-offs caused by this infection have repeatedly occurred in bottlenose dolphins (Turiops truncatus) and striped dolphins (Stenella coeruleoalba), both of which belong to the fami...

Barge, J.; Carbon, C.; Lamotte-Barrillon, S., 1976: The veno-occlusive liver disease: nosology and diagnostic difficulties. La Semaine des Hopitaux 52(16): 1021-1025

Ahmed, N., K.; Martin, L., A.; Watts, L., M.; Palmer, J.; Thornburg, L.; Prior, J.; Esser, R., E., 1992: Peptidyl fluoromethyl ketones as inhibitors of cathepsin B: Implication for treatment of rheumatoid arthritis. Peptidyl fluoromethyl ketones (FMKs), with the amino acid sequence Phe-Ala held constant but with variable N-terminal groups, were synthesized and tested for inhibition of the cysteine proteinase cathepsin B. The FMKs were effective in inhibiting...

Davis, M.C.; Twamley, E.W.; Hamilton, N.A.; Swan, P.D., 2000: Body fat distribution and hemodynamic stress responses in premenopausal obese women: a preliminary study. To examine the relationship between body fat distribution and hemodynamic stress responses, cardiovascular responses to a speech task and a forehead cold pressor task were evaluated with 24 premenopausal women classified a priori as either central...

Lorenz, R.J., 1961: On the effect of pipetting errors on accuracy in the measurement of concentration of virus suspensions. Archiv für die Gesamte Virusforschung 10: 551-559

Siddiqui, T.; Elfenbein, G.J.; Noyes, W.D.; Moreb, J.S.; Oblon, D.; Weiner, R.S., 1990: Myelodysplastic syndromes presenting in pregnancy. A report of five cases and the clinical outcome. Five female patients, ranging in age between 22 and 36 years, presented with myelodysplastic syndromes during pregnancy between June 1982 and March 1987. Three of these five cases evolved into acute leukemia. A bone marrow transplant was attempted...

Blendis, L.; Wong, F., 1999: Does repeated paracentesis prevent spontaneous bacterial peritonitis?. American Journal of Gastroenterology 94(10): 2798-2800