Nutrition and Gastrointestinal Parasitism in Ruminant Production Nutrición Y Parasitismo Gastrointestinal En Producción De Rumiantes

BROOD PARASITISM INCREASES MORTALITy Of BAy-WINgED COWBIRD NESTS El Parasitismo de Cría Aumenta la Mortalidad de Nidos de Agelaioides badius

The Condor, Vol. 112, Number 2, pages 407–417. ISSN 0010-5422, electronic ISSN 1938-5422.  2010 by The Cooper Ornithological Society. All rights reserved. Please direct all requests for permission to photocopy or reproduce article content through the University of California Press’s Rights and Permissions website, http://www.ucpressjournals.com/ reprintInfo.asp. DOI: 10.1525/cond.2010.090118 R...

Starch in ruminant diets: a review¤ Almidones en la alimentación de rumiantes: revisión de literatura Amido na alimentação dos ruminantes: revisão de literatura

Brood parasitism of White-rumped Swallows by Shiny Cowbirds

Swallows and martins are infrequent hosts of the generalist brood parasite Shiny Cowbird (Molothrus bonariensis). We monitored 50 nesting attempts by White-rumped Swallows (Tachycineta leucorrhoa) over a two-year period in Argentina and detected low rates of brood parasitism (three nests, or 6%). Of the three nests parasitized, cowbirds (N = 1 per nest) successfully fledged from two. Eight of 1...

Learning Through Foraging Consequences: A IVIechanism of Feeding Niche Separation in Sympatric Ruminants

Explanations for why sympatric ruminant species select diets composed of different plant species or plant parts have been controversial. Our explanation is based on learning from foraging consequences, which includes the influences that morphology, physiology, and experience have on diet selection. We conducted a trial with cattle (Bos taurus), sheep (Ovis arias), and goats (Capra hircus) and l...

Ruminant self-medication against gastrointestinal nematodes: evidence, mechanism, and origins☆

Gastrointestinal helminths challenge ruminants in ways that reduce their fitness. In turn, ruminants have evolved physiological and behavioral adaptations that counteract this challenge. Ruminants display anorexia and avoidance behaviors, which tend to reduce the incidence of parasitism. In addition, ruminants appear to learn to self-medicate against gastrointestinal parasites by increasing con...