scholarly journals Factors affecting bovine ketosis and its association with non-return rate

1983 ◽  
Vol 55 (6) ◽  
pp. 497-507
Author(s):  
U. B. Lindström ◽  
Marcus Von Bonsdorff ◽  
Jouko Syväjärvi
Keyword(s):  
Least Squares ◽  
Statistical Models ◽  
Return Rate ◽  
Factors Affecting ◽  
Return Rates ◽  
Commercial Feed ◽  
Prophylactic Measures

Data on 16406 cows (6025 recorded) from the area of the East & Central Al Society were analysed by least squares procedures. Ketosis incidence was determined from the milk by a commercial keto test reagent by AI technicians in connection with the ordinary first insemination of a particular cow. Ketosis incidence was on average 11.5 %, increased up to about the 4th - 5th parity and was significantly higher in larger herds. Breed did not significantly affect ketosis incidence. There was a tendency for higher incidence with increasing usage of commercial feed mixtures. Cows with ketosis milked less than unaffected ones and cows inseminated earlier than 60 days after calving had significantly higher incidence than cows inseminated later. The complete statistical models accounted for only 5 % (all herds) and 9 % (recorded herds) of variation in ketosis incidence, indicating the need for better measures of the herd environment. Heritabilities for ketosis incidence were not significantly different from zero. Cows with ketosis had significantly poorer non-return rates than unaffected ones, indicating the need for prophylactic measures.

scholarly journals Atlantic salmon return rate increases with smolt length

2019 ◽  
Vol 76 (6) ◽  
pp. 1702-1712 ◽  
Author(s):  
Stephen D Gregory ◽  
Anton T Ibbotson ◽  
William D Riley ◽  
Marie Nevoux ◽  
Rasmus B Lauridsen ◽  
...  
Keyword(s):  
Body Size ◽  
Atlantic Salmon ◽  
Survival Rates ◽  
Empirical Support ◽  
Return Rate ◽  
Imperfect Detection ◽  
Factors Affecting ◽  
Return Rates ◽  
Life Phase ◽  
Marine Survival

Abstract Recent declines in Atlantic salmon Salmo salar populations are generally attributed to factors in their marine life-phase. However, it is postulated that factors affecting their freshwater life-phase might impact their marine survival, such as the influence of body size. While larger smolts are widely hypothesized to have higher marine survival rates, empirical support remains scant, in part due to inadequate data and ambiguous statistical analyses. Here, we test the influence of smolt body size on marine return rates, a proxy for marine survival, using a 12-year dataset of 3688 smolts tagged with passive integrated transponders in the River Frome, Southern England. State-space models describe the probability of smolts surviving their marine phase to return as 1 sea-winter (1SW) or multi-sea-winter adults as a function of their length, while accounting for imperfect detection and missing data. Models predicted that larger smolts had higher return rates; the most parsimonious model included the effect of length on 1SW return rate. This prediction is concerning, as freshwater juvenile salmon are decreasing in size on the River Frome, and elsewhere. Thus, to maximize adult returns, restoration efforts should focus on freshwater life-stages, and maximize both the number and the size of emigrating smolts.

Gestation length, birth weight and growth rates of pure-bred indigenous goats and their crosses in Kenya

1988 ◽  
Vol 111 (2) ◽  
pp. 363-368 ◽  
Author(s):  
F. Ruvuna ◽  
T. C. Cartwright ◽  
H. Blackburn ◽  
M. Okeyo ◽  
S. Chema
Keyword(s):  
Growth Rate ◽  
Birth Weight ◽  
Statistical Analysis ◽  
Least Squares ◽  
Growth Rates ◽  
Gestation Length ◽  
East African ◽  
Factors Affecting ◽  
Cross Breeding ◽  
Indigenous Goats

SummaryData on gestation period of 701 indigenous East African and Galla does and pre- and postweaning growth of 810 pure-bred and cross-bred kids were analysed by least squares statistical analysis. Breeds of kids were East African, Galla, Toggenburg × East African, Toggenburg × Galla, Anglo-Nubian × East African and Anglo-Nubian × Galla. Average gestation length was 149 days and was significantly (P < 0·05) affected by type of birth of the kid, year–month of kidding, and age of dam. Does carrying twins had shorter gestation length than does carrying singles. Sex and breed of kid did not have significant effect on gestation length.Significant (P < 0·05) factors affecting birth weight, weight at 30, 60, 90, 120, 150, 210 and 270 days of age, and preweaning growth rate were breed and sex of kid, type of birth, year–month and age of dam. Male kids grew faster and were heavier than females. Kids born single were heavier and grew faster than twin-born kids. Kids from dams less than 3 years old weighed less than kids from older dams. Cross-bred kids had higher preweaning growth rates than indigenous pure-bred kids. The Anglo-Nubian × Galla cross was heaviest while the East African ranked lowest. The results point to importance of cross-breeding with temperate breeds to increase growth rates of indigenous goats. Comparison of Toggenburg and Anglo-Nubian sires for cross-breeding showed both buck breeds produced kids with roughly equal growth rates. Evaluation of indigenous Galla and East African dams for cross-breeding showed Galla dams produced heavier kids than East African but preweaning growth rates were not significantly different.

Statistical Models and Least Squares

1982 ◽  
pp. 216-223
Author(s):  
G. Barrie Wetherill
Keyword(s):  
Least Squares ◽  
Statistical Models

Survivorship.

2021 ◽  
pp. 218-226
Author(s):  
Donald Quicke ◽  
Buntika A. Butcher ◽  
Rachel Kruft Welton
Keyword(s):  
Statistical Models ◽  
Grass Cover ◽  
Native Grass ◽  
Factors Affecting ◽  
Charadrius Vociferus

Abstract This chapter describes the use of statistical models to determine the factors affecting the survival of killdeer (Charadrius vociferus) nests at gravelled oil pads and on native grass cover in western Oklahoma, USA.

Survivorship.

2021 ◽  
pp. 218-226
Author(s):  
Donald Quicke ◽  
Buntika A. Butcher ◽  
Rachel Kruft Welton
Keyword(s):  
Statistical Models ◽  
Grass Cover ◽  
Native Grass ◽  
Factors Affecting ◽  
Charadrius Vociferus

Abstract This chapter describes the use of statistical models to determine the factors affecting the survival of killdeer (Charadrius vociferus) nests at gravelled oil pads and on native grass cover in western Oklahoma, USA.

scholarly journals Factors affecting growth traits of beef cattle breeds raised inSlovakia

2011 ◽  
Vol 50 (No. 1) ◽  
pp. 14-21 ◽  
Author(s):  
E. Krupa ◽  
M. Oravcová ◽  
P. Polák ◽  
J. Huba ◽  
Z. Krupová
Keyword(s):  
Birth Weight ◽  
Beef Cattle ◽  
Least Squares ◽  
Linear Model ◽  
Growth Traits ◽  
General Linear Model ◽  
Weaning Weight ◽  
Factors Affecting ◽  
Sex Effect ◽  
Beef Cattle Breeds

Growth traits of purebred calves of six beef breeds (Aberdeen Angus &ndash; AA, Blonde d&rsquo;Aquitaine &ndash; BA, Charolais &ndash; CH,Hereford &ndash; HE, Limousine &ndash; LI and Beef Simmental &ndash; BS) born from 1998 to 2002 were analysed. Traits under study were birth weight (BW), weight at 120 days (W120), weight at 210 days &ndash; weaning weight (WW), weight at 365 days &ndash; yearling weight (YW) and average daily gains from birth to 120 days (ADG1), from birth to 210 days (ADG2), from birth to 365 days (ADG3), from 120 to 210 days (ADG4). General linear model with class effects of breed, dam&rsquo;s age at calving, sex, herd-year-season (HYS) and covariation of age at weighing was used for analyses. All effects significantly affected both weight and gain traits except for dam&rsquo;s age that was significant for BW, W120, YW and ADG3, and age at weighing that was significant for W120, WW, YW, ADG2, ADG3, ADG4. Estimated least squares means of growth traits were compared using Scheffe&rsquo;s multiple-range tests. Highest BW (40.57&nbsp;kg) and W120 (172.43 kg) were found for BA calves. BS calves had highest WW (260.30 kg), YW (424.07 kg), ADG1 (1&nbsp;154&nbsp;g), ADG2 (1 053 g), ADG3 (1 054 g) and ADG4 (1 098 g). Highest BW, YW, ADG3 and ADG4 were found for males-singles. Males-twins had highest W120, WW, ADG1 and ADG2. Calves descending from 5&ndash;7 years old dams had highest BW, W120, WW, ADG1, ADG2 and ADG4. The proportion of variability of growth traits explained by HYS effect (42.96&ndash;71.69%) was high, whereas proportions of variability explained by SEX effect (2.03&ndash;5.77%), age of dam (1.02&ndash;2.24%) and breed (1.05&ndash;2.21%) were low. Residuals accounted for 23.71 up to 53.79% of total variance. &nbsp;

Investment apportionments among participants of PPP rental retirement villages

2019 ◽  
Vol 10 (1) ◽  
pp. 64-77
Author(s):  
Shijing Liu ◽  
Hongyu Jin ◽  
Chunlu Liu ◽  
Benzheng Xie ◽  
Anthony Mills
Keyword(s):  
Pension Funds ◽  
Return Rate ◽  
Key Factors ◽  
Content Type ◽  
Factors Affecting ◽  
Investment Allocation ◽  
Research Findings ◽  
The Government ◽  
Mean Variance

Purpose The purpose of this paper is to examine public–private partnership (PPP) approaches for the construction of rental retirement villages in Australia and to allocate the investment proportions under a certain project return rate among three investors which are the government, private sectors and pension funds. The apportionment will achieve a minimum overall investment risk for the project. Design/methodology/approach Capital structure, particularly determination of investment apportionment proportions, is one of the key factors affecting the success of PPP rental retirement villages. Markowitz mean-variance model was applied to examine the investment allocations with minimum project investment risks under a certain projected return rate among the PPP partners for the construction of rental retirement villages. Findings The research findings validate the feasibility of the inclusion of pension funds in the construction of PPP rental retirement villages and demonstrate the existence of relationships between the project return rate and the investment allocation proportions. Originality/value This paper provides a quantitative approach for determination of the investment proportions among PPP partners to enrich the theory of PPP in relation to the construction of rental retirement villages. This has implications for PPP partners and can help these stakeholders make vital contributions in developing intellectual wealth in the PPP investment area while providing them with a detailed guide to decision making and negotiation in relation to investment in PPP rental retirement villages.

scholarly journals Cost and Effectiveness of Reminders to Promote Colorectal Cancer Screening Uptake in Rural Federally Qualified Health Centers in West Virginia

2020 ◽  
Vol 21 (6) ◽  
pp. 891-897
Author(s):  
Mary Ellen Conn ◽  
Stephenie Kennedy-Rea ◽  
Sujha Subramanian ◽  
Adam Baus ◽  
Sonja Hoover ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Cancer Screening ◽  
West Virginia ◽  
Colorectal Cancer Screening ◽  
Return Rate ◽  
Health Centers ◽  
Federally Qualified Health Centers ◽  
Process Measures ◽  
Return Rates ◽  
Phone Calls

The purpose of this study is to evaluate the effectiveness of the West Virginia Program to Increase Colorectal Cancer Screening in implementing patient reminders to increase fecal immunochemical test (FIT) kit return rates in nine federally qualified health centers (FQHCs). Using process measures and cost data collected, the authors examined the differences in the intensity of the phone calls across FQHCs and compared them with the return rates achieved. They also reported the cost per kit successfully returned as a result of the intervention. Across all FQHCs, 5,041 FIT kits were ordered, and the initial return rate (without a reminder) was 41.1%. A total of 2,201 patients received reminder phone calls; on average, patients received 1.61 reminder calls each. The reminder interventions increased the average FIT kit return rate to 60.7%. The average total cost per FIT kit returned across all FQHCs was $60.18, and the average cost of only the reminders was $11.20 per FIT kit returned. FQHCs achieved an average increase of 19.6 percentage points in FIT kit return rates, and costs across clinics varied. Clinics with high-quality health information systems that enabled tracking of patients with minimal effort were able to implement lower cost reminder interventions.

Some effects of handling techniques on returns of tagged Australian salmon, Arripis trutta (Bloch & Schneider)

1983 ◽  
Vol 34 (6) ◽  
pp. 845 ◽  
Author(s):  
CA Stanley
Keyword(s):  
Return Rate ◽  
Migratory Species ◽  
Scale Removal ◽  
Return Rates ◽  
Adverse Conditions ◽  
Behavioural Changes ◽  
Behaviour Changes

Return rates of different tag types used on Australian salmon were briefly reviewed. Internal tags, especially with attached plastic streamers, were clearly superior. The effects of time held before tagging and injury (including scale removal) on return rate were investigated. There was no evidence of any mortality caused by these factors and salmon appear to be a robust species, little affected by the stress caused by tagging operations. However, when fish were held under adverse conditions for long periods, or when wounds were pronounced, behaviour changes were evident, which resulted in the non- participation of affected fish in movements from juvenile to adult areas. Such behavioural changes may be of importance in analysing tag data from other pelagic migratory species that could be more easily affected by stress.

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