Association between body condition score and live weight in pasture-based Holstein-Friesian dairy cows

peer-reviewedThe objective was to quantify the strength of the relationship between body condition score (BCS) and live weight (LW) in pasture-based Holstein-Friesian dairy cattle, and to determine the kg LW per unit BCS. A total of 26021 test-day records with information on both BCS (1–10 scale, where 1 is emaciated and 10 is obese) and LW across 1110 lactations from one research farm were used in the analysis. Correlation and regression analyses were used to determine the degree of association between BCS and LW in different parities, stages of the inter-calving interval and years. Correlations between BCS and LW were relatively consistent, with the mean correlation between BCS and LW across all data of 0·55 implying that differences in BCS explain approximately 30% of the variation in LW. Significantly different regressions of LW on BCS were present within stage of inter-calving interval by parity subclasses. Excluding calving, LW per unit BCS varied from 17 kg (early to mid lactation in parity 1) to 36 kg (early lactation in parity 4 and 5). However, LW per unit BCS was greatest at calving varying from 44 kg in first parity animals to 62 kg in second parity animals. On average, 1 BCS unit equated to 31 kg LW across all data

Finite Conductivity Minimum in Bilayer Graphene without Charge Inhomogeneities

Boltzmann transport theory fails near the linear band-crossing of single-layer graphene and near the quadratic band-crossing of bilayer graphene. We report on a numerical study which assesses the role of inter-band coherence in transport when the Fermi level lies near the band-crossing energy of bilayer graphene. We find that interband coherence enhances conduction, and that it plays an essential role in graphene's minimum conductivity phenomena. This behavior is qualitatively captured by an approximate theory which treats inter-band coherence in a relaxation-time approximation. On the basis of this short-range-disorder model study, we conclude that electron-hole puddle formation is not a necessary condition for finite conductivity in graphene at zero average carrier density.Comment: revised version as published in Phys. Rev.

Alien Registration- Macdonald, John A. (Wade, Aroostook County)

https://digitalmaine.com/alien_docs/32463/thumbnail.jp

Alien Registration- Macdonald, John A. (Auburn, Androscoggin County)

https://digitalmaine.com/alien_docs/31147/thumbnail.jp

Recontextualizing the Case Study

Case studies are very difficult to use with students who will not read them or whose reading skills are too poor to absorb the details of the case necessary to use it in a class discussion or paper.  This paper explores a way to write cases that will engage such students, be memorable to them, and prompt lively discussion and achievement of learning goals.  It is based on the work of Walter J. Ong and involves centering cases around a context with which the student can identify personally.  The case was designed to facilitate ethical discussions in a senior finance course, but the techniques are applicable to any discipline at any level

Investigating the effects of inter-annual weather variation (1968- 2016) on the functional response of cereal grain yield to applied nitrogen, using data from the Rothamsted Long-Term experiments

The effect of weather on inter-annual variation in the crop yield response to nitrogen (N) fertilizer for winter wheat (Triticum aestivvum L.) and spring barley (Hordeum vulgare L.) was investigated using yield data from the Broadbalk Wheat and Hoosfield Spring Barley long-term experiments at Rothamsted Research. Grain yields of crops from 1968 to 2016 were modelled as a function of N rates using a linear-plus-exponential (LEXP) function. The extent to which inter-annual variation in the parameters of these responses was explained by variations in weather (monthly summarized temperatures and rainfall), and by changes in the cultivar grown, was assessed. The inter-annual variability in rainfall and underlying temperature influenced the crop N response and hence grain yields in both crops. Asymptotic yields in wheat were particularly sensitive to mean temperature in November, April and May, and to total rainfall in October, February and June. In spring barley asymptotic yields were sensitive to mean temperature in February and June, and to total rainfall in April to July inclusive and September. The method presented here explores the separation of agronomic and environmental (weather) influences on crop yield over time. Fitting N response curves across multiple treatments can support an informative analysis of the influence of weather variation on the yield variability. Whilst there are issues of the confounding and collinearity of explanatory variables within such models, and that other factors also influence yields over time, our study confirms the considerable impact of weather variables at certain times of the year. This emphasizes the importance of including weather temporal variation when evaluating the impacts of climate change on crops

The Downstream Effects of Bail and Pretrial Detention on Racial Disparities in Incarceration

Bail and pretrial detention decisions may have important consequences for racial disparities in incarceration rates. Poor minority defendants who are unable to post bail and get released from jail before trial may be more likely to plead guilty and accept longer sentences of incarceration. Racial disparities in incarceration sentences may then reflect a combination of differences in the seriousness of a defendant’s case, criminal history, and economic resources to pay bail. This study examines the extent to which bail decision-making and pretrial detention explain Black-White disparities in criminal adjudications and sentences in the Delaware courts from 2012 to 2014. Over 80% of all criminal defendants have a bond imposed on them before their adjudication. Almost a third of cases involve pretrial detention. After controlling for measured differences in a variety of case characteristics, including severity of charges and criminal histories, cash-only bail and pretrial detention increase a defendant’s likelihood of conviction and pleading guilty, being incarcerated, and receiving a longer incarceration sentence. Bail and pretrial detention also contribute to 30% to 47% of the explained Black-White disparity in these court dispositions. Careful examination of cash-only bail, bail amount, and pretrial detention policies may help reduce racial disparities in incarceration

Bilayer Quantum Hall Systems at Filling Factor \nu=2: An Exact Diagonalisation Study

We present an exact diagonalisation study of bilayer quantum Hall systems at a filling factor of two in the spherical geometry. We find the high-Zeeman-coupling phase boundary of the broken symmetry canted antiferromagnet is given exactly by previous Hartree-Fock mean-field theories, but that the state's stability at weak Zeeman coupling has been qualitatively overestimated. In the absence of interlayer tunneling, degeneracies occur between total spin multiplets due to the Hamiltonian's invariance under independent spin-rotations in top and bottom two-dimensional electron layers.Comment: Some remarks added in the discussion of the phase diagram, and some typos corrected. Version to be published in Phys. Rev. Let