The physiology and impact on fertility of the period of proestrus in lactating dairy cows

Abstract In cattle, proestrus begins with the initiation of luteolysis and ends with initiation of estrus and the GnRH/LH surge. This period is marked by a dramatic decrease in circulating progesterone (P4) that reaches a nadir by about 36-48 h in cows undergoing natural or prostaglandin F2α (PGF)-induced luteolysis. Inadequate luteolysis is a cause of reduced fertility particularly in timed AI programs with small elevations in circulating P4 reducing fertility. Increasing circulating estradiol (E2) during proestrus is dependent on presence, size, and function of the dominant follicle and this varies during natural proestrus, due to whether animals have two or three follicular waves, and during PGF-induced proestrus, according to stage of the follicular wave at time of PGF treatment. Inadequate circulating E2 can limit fertility and increase pregnancy loss in some specific circumstances such as in cows with low BCS and in cows during heat stress. Thus, studies to optimize the length of proestrus and the concentrations of E2 and P4 during proestrus could produce substantial improvements in fertility and reductions in pregnancy loss

Fertilization rate and embryo quality in superovulated Holstein heifers artificially inseminated with X-sorted or unsorted sperm.

Made available in DSpace on 2018-05-30T00:49:29Z (GMT). No. of bitstreams: 1 ID24857.pdf: 256135 bytes, checksum: 6121766d34eaa77c92943eb65ef77a2c (MD5) Previous issue date: 2005-04-01bitstream/item/177872/1/ID-24857.pd

Sustainability and Corporate Social Responsibility in the Perspective of Social Economy Entities: A Bibliometric Study

We start from the conceptual interconnection between Sustainability and Corporate Social Responsibility, which, although continuously subject to controversy, both within the scope of its definition and in its performance, advocate, as the ultimate goal, human development and of the society in general, promoting the interests of the Communities on a permanent, long-term basis and without compromising the options of the future generations. In this context, we cannot fail to draw a parallel with the entities that constitute the Social Economy Sector. The activities they carry out are of economic and social nature and must be pursued in the general interest of their members, users and beneficiaries, thus in the general interest of the Community. These institutions also reveal concerns about the sustainability in all the dimensions involved (economic, social and environmental), in which the organizational performance is particularly important, as it becomes imperative to guarantee their continuity, fostering and promoting their social action. We will, therefore, start by framing what is meant by Sustainability, Corporate Social Responsibility and Social Economy, with a particular focus on the current requirements of stakeholders regarding the socially responsible behaviour of the institutions as these, in turn, will entail the adoption of more comprehensive management tools, also more efficient and transparent concerning all dimensions (economic, financial and social). It is within this framework that a project called “TFA—TheoFrameAccountability—Theoretical framework for the promotion of accountability in the social economy sector: The IPSS case” emerges, being promoted by the University of Aveiro, with the participation of National Confederation of Solidarity Institutions (CNIS—acronym in Portuguese), and the Polytechnic Institutes of Coimbra and Porto. This project aims to promote the accountability of the social economy sector (economic, financial and social aspects), in the Private Social Solidarity Institutions (IPSS—acronym in Portuguese), assisting them not only in fulfilling their legal obligations, but also facilitating the reporting of results of activities carried out in a more effective manner and promoting transfer of knowledge (for the IPSS and also for the academic community), thus contributing to the development and sustainability of these institutions. Thus, we develop an exploratory and descriptive analysis, of a quantitative-qualitative nature, in which the procedures of data collection determine the result of the search strategy by the defined descriptors. For this purpose, the analysis will focus on the following variables: number of articles published per year; methodologies used; theories of support; identification by sector/area of activity; countries of origin; more representative institutions; authors who publish more and journals with the largest number of publications. The main results indicate a growing concern about sustainability and a growing publication in this area. This paper presents a bibliometric study to evaluate the main trends of current research on sustainability and on corporate social responsibility, thus contributing to the construction of the theoretical basis underlying the “TFA—TheoFrameAccountability” project.info:eu-repo/semantics/publishedVersio

Avaliação de acessos da CONFE sob sistema irrigado por aspersão (Phaseolus vulgaris L.) em ambiente de campo.

O objetivo deste estudo foi caracterizar quanto a tolerância à alta temperatura, os acessos de feijão-comum que integram a coleção nuclear de feijão da Embrapa, em experimento de camp

Avaliação dos componentes de produtividade em acessos de feijão-comum do pool gênico mesoamericano, cultivado sob deficiência hídrica em campo.

Este trabalho teve como objetivo avaliar os componentes de produtividade do feijão-comum sob irrigação adequada (controle) e deficiência hídrica em ensaios de campo

Check-list das Leguminosae do estado de Mato Grosso do Sul.

Made available in DSpace on 2018-08-15T00:33:06Z (GMT). No. of bitstreams: 1 70126021SM.pdf: 901532 bytes, checksum: 08a0ac84e5eeeb9aa57e5084a5642d05 (MD5) Previous issue date: 2018-08-14bitstream/item/181445/1/701-2602-1-SM.pd

Crescimento dos frutos de laranjeira 'Salustiana' situados em ramos anelados com diversas relações de folhas/frutos

A relação entre a área foliar e o crescimento dos frutos é um tema que freqüentemente recebe a atenção dos pesquisadores, por influenciar diretamente na produtividade das plantas e na qualidade dos frutos. Neste trabalho, avaliou-se o efeito da área foliar sobre o crescimento dos frutos da laranjeira 'Salustiana'. Foram utilizados ramos com 12 meses de idade e com apenas um fruto terminal. Os ramos foram anelados visando a manter diversas relações de folhas/fruto. Avaliaram-se, semanalmente, o crescimento dos frutos e os teores de amido presentes nas folhas durante um período de 42 dias. O crescimento dos frutos, avaliado na "fase de crescimento II", dependeu da área foliar disponível por fruto, sendo que 30 folhas foram suficientes para garantir o seu crescimento. As reservas de amido nas folhas dependeram da área foliar disponível por fruto e reduziram à medida que os frutos apresentaram aumentos no diâmetro e nas massas fresca e seca.The relationship between the foliar area and the fruit growth is an important theme because affects the tree productivity and fruits quality. In this work was evaluated the effect of the foliar area on the growth of the Salustiana's sweet orange fruits. Girdled shoots of 12 months were used with a single terminal fruit and several leaves-fruit ratios. It was evaluated, weekly, the fruit growth and the leaves starch contents during 42 days. The fruit growth, evaluated in the stage II, depended on the available leaf area per fruit, provided that 30 leaves were enough to guarantee its growth. The starch reserves in the leaves depended on the available leaf area per fruit and they reduced with the increase in the diameter and dry and fresh weight of the fruits

CMS physics technical design report : Addendum on high density QCD with heavy ions

Peer reviewe