Economic Analyses of the Reproductive Performance of Turkeys Under Certain Environmental Conditions

The objective of this study was to evaluate the effect of different hormonal protocols on the reproductive performance of Santa Inês ewes in Amazon environmental conditions. Twenty-two Santa Inês ewes between 3 and 4 years-old were distributed in a randomized block experimental design, where the treatments consisted of two protocols for estrus synchronization (short and long) with eleven animals each. Data on the occurrence of estrus were described for each protocol. Data of estrus, pregnancy, and prolificity were firstly subjected to ANOVA and a subsequent Tukey’s test. Results were considered significant at p ≤ 0.05. The short-term protocol presented an interesting successful rate, where above 70% ewes tested had estrus. The long-term protocol also achieved a high successful rate, where above 80% ewes tested had estrus. However, comparing the protocols, the long-term protocol presented better results of positive estrus and pregnancy rates in ewes. Thus, it can be concluded that both protocols presented satisfactory results regarding estrus manifestation, and prolificity (lambs produced per ewe). However, under Amazon environmental conditions, the long-term protocol presented better results regarding positive manifestation of estrus and pregnancy rate.

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Effect of Season of Calving and Mastitis on Reproductive Performance of Baladi and Crossbred Cows (Baladi X Friesian) under the Environmental Conditions of Aswan Governorate in South Egypt

Journal of Animal and Poultry Production ◽

10.21608/jappmu.2017.45910 ◽

2017 ◽

Vol 8 (8) ◽

pp. 293-302

Author(s):

A. Damarany

Keyword(s):

Reproductive Performance ◽

Environmental Conditions ◽

Crossbred Cows

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Reproductive performance of two species ofPohliafrom temperate and sub-Antarctic stations under controlled environmental conditions

Transactions of the British Bryological Society ◽

10.1179/006813871804146274 ◽

1971 ◽

Vol 6 (2) ◽

pp. 278-295 ◽

Cited By ~ 15

Author(s):

G. C. S. Clarke ◽

S. W. Greene

Keyword(s):

Reproductive Performance ◽

Environmental Conditions

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Capital and income breeding traits differentiate trophic match–mismatch dynamics in large herbivores

Philosophical Transactions of the Royal Society B Biological Sciences ◽

10.1098/rstb.2012.0484 ◽

2013 ◽

Vol 368 (1624) ◽

pp. 20120484 ◽

Cited By ~ 45

Author(s):

Jeffrey Kerby ◽

Eric Post

Keyword(s):

Life History ◽

Reproductive Performance ◽

Environmental Conditions ◽

Life History Strategies ◽

Breeding Strategies ◽

Large Herbivores ◽

Income Breeding ◽

Resource Variability ◽

Capital And Income Breeding ◽

Trophic Mismatch

For some species, climate change has altered environmental conditions away from those in which life-history strategies evolved. In such cases, if adaptation does not keep pace with these changes, existing life-history strategies may become maladaptive and lead to population declines. We use life-history theory, with a specific emphasis on breeding strategies, in the context of the trophic match–mismatch framework to form generalizable hypotheses about population-level consumer responses to climate-driven perturbations in resource availability. We first characterize the income and breeding traits of sympatric caribou and muskoxen populations in western Greenland, and then test trait-based hypotheses about the expected reproductive performance of each population during a period of high resource variability at that site. The immediate reproductive performance of income breeding caribou decreased with trophic mismatch. In contrast, capital breeding muskoxen were relatively unaffected by current breeding season resource variability, but their reproductive performance was sensitive to resource conditions from previous years. These responses matched our expectations about how capital and income breeding strategies should influence population susceptibility to phenological mismatch. We argue for a taxon-independent assessment of trophic mismatch vulnerability based on a life-history strategy perspective in the context of prevailing environmental conditions.

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