Age-related changes in breeding performance are likely to be mediated through changes in parental foraging performance. We investigated the relationship of foraging performance with age in female little penguins at Phillip Island, Australia, during the guard phase of the 2005 breeding season. Foraging parameters were recorded with accelerometers for birds grouped into three age-classes: (1) you...

The present study evaluated effects of 0.0%, 0.5%, 0.75% and 1.0% L-threonine in diet on performance and gastrointestinal tract development in broiler chickens during summer. From 0 to 42 days old, body weight gain was greater in 0.75% L-threonine fed birds than in 0.0% and 0.5% L-threonine fed birds (P0.05). During the growth period, 0.75% L-threonine fed birds had the highest body weight gain...

Now a long time ago, avian remains from the Vallès-Penedès Basin and other Miocene localities inaugurated study of Neogene birds Spain. After so much time, it is suitable to review them. Fossils unknown far same or close taxa rest Iberian Peninsula are also presented in this paper. The majority species belong Phasianidae. present paper participates discussion about systematic validity various f...

This study evaluated the behavior of broiler chickens subjected to thermal stress during different periods day and age birds. A total 180 one-day-old male chicks were allocated three chambers. Each chamber contained five boxes, with 12 chicks/box. Birds assigned a completely randomized design. The birds filmed, images recorded every minute two periods: morning (from 08:00 09:00 h) afternoon 17:...

This study conducted to evaluate the effect of prebiotics (Fermacto) and isoleucine and their combination on performance and some blood parameters of broiler chickens during finisher period. At the first of experiment 300 one-day-old mixed Ross broiler chicks reared in same condition according to Ross manual guide up to 21 days old. Chicks at 21 day old were randomly allocated to 20 groups of 1...

A total of 300 one-day old male broilers (Cobb 500) were randomly divided into four treatment groups. The groups comprised of 15 birds each, and were defined by diet and the birds in each group were fed 0 (control), 3, 5, or 7 kGy electron-beam irradiated diets. A total of 5 replicates were performed. The chemical composition of the diet was not affected by irradiation.Irradiation doses of 5 an...

Molecular analysis of collagen sequences from an 80 million year old hadrosaur B. canadensis and a 68 million year old dinosaur T. rex suggest strongly that B. canadensis is an outgroup to a clade containing T. rex and birds, fully consistent with the wellestablished phylogeny based on morphological analyses of fossils. Molecular analysis of collagen sequences from an 80 million year old hadros...

This study aimed to evaluate the effect of energy levels on growth performance and yield broilers Caipira French Pedrês, slaughtered at 77, 84 90 days old. We used 192 day old chicks, mixed, reared under intensive birds/m2 density 6.4. The experimental design was completely randomized with four replications three treatments, unit being a box 16 birds. Treatments were defined by diets in initial...