Mariana Ciacciariello

Mariana Ciacciariello
University of KwaZulu-Natal | ukzn · Department of Animal and Poultry Science

PhD

About

22
Publications
1,893
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173
Citations
Introduction
Skills and Expertise
Additional affiliations
July 2006 - present
University of KwaZulu-Natal
Position
  • Professor (Associate)

Publications

Publications (22)
Article
Full-text available
Robust energy systems (ES) are required to execute accurate feed formulation. Based on the premise that the more accurate an ES is, the better it will predict performance, a predictive model was developed to evaluate the veracity of five ES proposed for formulating layer diets. Data were derived from a meta-analysis of three experiments conducted o...
Article
Full-text available
Commercial premixes provide trace minerals (TM) such as zinc (Zn), manganese (Mn), and copper (Cu) in excess of the requirements to maximize broiler performance. High inclusion levels of TM in broiler feed and their low absorption in the gastrointestinal tract leads to increased levels of TM in the excreta, resulting in the contamination of the env...
Article
Full-text available
An investigation into whether the nutrient requirement of egg-laying hens has changed with genotype improvements was conducted. This study compared the response of individually housed laying hens of two different genotypes and ages. The strains used were a heritage breed in mid-lay and a modern breed at peak production. Energy was utilized with the...
Article
Commercial broiler premixes provide trace minerals (TMs) such as Zinc (Zn), Manganese (Mn) and Copper (Cu) above the birds' requirements to maximise broiler performance. High inclusion levels of TM and their low absorption in the broiler's gastrointestinal tract have led to increased TM levels in their litter, raising concerns about TM's accumulati...
Article
Full-text available
This experiment investigated the effect of excess crude protein and/or calcium on male broiler breeder fertility. Forty-eight broiler breeder males, from a group of 60, that consistently produced a semen sample were allocated to one of four dietary treatments, formulated to provide either the male or female recommendation for crude protein and calc...
Article
Full-text available
The world's population is expected to reach 9.8 billion people by 2050. Increases in population size, coupled with socioeconomic changes such as urbanisation, age demographics, and increasing affluence levels, will double the demand for poultry products by 2050. The primary objective of agribusiness is to ensure food security for the global populat...
Article
Full-text available
This experiment compared fertility of male broiler breeders with different crude protein (CP) intakes from diets containing 9.7%, 11.7% and 13% CP from 27 to 60 weeks of age (in two phases) and in a different group of birds from 52 to 60 weeks of age. This was to assess fertility of males with different CP intakes, as well as comparing fertility in...
Article
The objective of the trial reported here was to determine whether breast meat yield would improve in broilers reared on short daylengths if higher levels of dietary protein were fed. To that end, 3200 Ross 308 International broilers were reared to 35 d in eight light-tight rooms, each room being divided into four pens which were populated with 100...
Article
Full-text available
The CP and amino acid requirements for broiler breeder hens have historically been determined by assessing the response of these birds in terms of egg production. However, based on increasing evidence on the effects of maternal nutrient intake on offspring performance, this should be revised. In addition, the nutrition management of broiler breeder...
Article
Full-text available
The CP and amino acid requirements for broiler breeder hens have historically been determined by assessing the response of these birds in terms of egg production. However, based on increasing evidence on the effects of maternal nutrient intake on offspring performance, this should be revised. In addition, the nutrition management of broiler breeder...
Article
Spring-hatched broiler breeders housed in non-lightproof facilities are frequently maintained on long daylengths to prevent precocity, but controlled-feeding and delayed dissipation of photorefractoriness retard sexual maturation. Trials were conducted to determine the appropriate growth for birds maintained on 14-h photoperiods, and to compare res...
Article
1. In two trials, broiler breeders were grown to a mean body weight of 2.0 to 2.2 kg at 20 weeks on 8L:16D and transferred to 16L:8D at various ages between 69 and 175 d of age at mean body weights varying between 1.0 and 2.7 kg. Other groups were grown to have a mean 20-week body weight 0.87, 1.15, 1.25 or 1.37 of the normal birds and photostimula...
Article
Egg production by meat-type fowl is markedly inferior to that from commercial laying hens, and so, to assess the degree to which photorefractoriness might be a contributing factor, male- and female-line broiler breeders were maintained on 8-, 11- or 16-h photoperiods. In addition, to determine the age-related rate of change in response to an increm...
Article
The effects of the growth curve from 15 to 20 weeks, age at photostimulation and pattern of photostimulus on sexual maturity, egg production and egg weight were evaluated in two trials with broiler breeder females to 56 and 34 weeks of age (housed in litter pens and individually caged, respectively). Carcase composition and reproductive morphology...
Article
Full-text available
Two trials were conducted to investigate the effects of growth manipulation and early photostimulation on age at sexual maturity and, in one trial, subsequent laying performance, in broiler breeders. In the first trial, the possibility of reducing the age at sexual maturity, using early photostimulation and increasing the growth rate to achieve 210...
Article
1. Photorefractoriness was assessed in two lines of broiler breeders. In one trial, male-line and female-line pullets were reared on the floor and transferred to individual cages at 15 weeks. Birds were either maintained on 8-, 11- or 16-h photoperiods or transferred from 8- to 16-h photoperiods at 67 or 124 d. In the second trial, female-line pull...
Article
The objective of this study was the evaluation of the use of different measures as predictors of breast weight. Thirty-two Anak chicks and 32 Ross chicks were used for the experiment 1. They were randomly sampled from two populations of 400 broilers of each genotype. A slaughter followed by dissection of commercial cuts was done at 53 days old. The...
Article
El objetivo del presente trabajo fue evaluar la utilización de distintas mediciones como predictores del peso de la pechuga. En la experiencia 1 se utilizaron 32 pollos Anak y 32 pollos Ross, muestreados al azar de dos lotes de 400 animales de cada genotipo. A los 53 dias de edad se realizó la faena y una disección de cortes comerciales. Se tomaron...
Article
Full-text available
The objective of this paper was to determine the differences in yield and body composition between a commercial strain (COM) and a weakly selected strain (FR) of broilers at two slaughter ages on diets differing in protein content. There were 306 males reared on litter floor pens, fed ad libitum, and randomly assigned to 16 pens in a 2 × 2 factoria...
Article
Full-text available
The extrusion and dehulling of sweet blue lupins (Lupinus angustifolius, cultivar Wonga) were evaluated in terms of their effect on the nitrogen corrected apparent metabolisable energy (AMEn) value and broiler performance. A trial was conducted where four lupin products, namely: lupin meal (LM), dehulled lupin meal (DLM), extruded lupin meal (ELM)...

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