Aim:

To find and extract data from original studies that assess growth, health and productivity parameters of livestock animals fed with GMO-containing feeds.

Selection criteria:

In order to be included in the database a study needs to fulfill each of the following criteria:

Relevant populations: Cattle, pig, sheep, goat, poultry and fish.

Relevant exposure: Feed containing genetically modified organisms.

Relevant comparator: Feed containing the non-genetically modified conventional counterpart of the respective GMOs.

Relevant outcomes: Measurements of any growth, health and productivity parameters.

Search strategy:

The search of original research articles was performed using Scopus (http://www.scopus.com/ webcite), a large abstract and citation database of peer-reviewed literature using the following search string: TITLE-ABS-KEY ( "genetically modified"  OR  "genetically engineered"  OR  biotech*  OR  transgenic )  AND  TITLE-ABS-KEY ( cattle  OR  dairy  OR  cow*  OR  goat  OR  rabbit  OR  farm*  OR  fish  OR  poultry  OR  chicken  OR  hen  OR  pig*  OR  sheep  OR  calf )  AND  TITLE-ABS-KEY ( fed  OR  feeding  OR  consumption  OR  diet )  AND  TITLE-ABS-KEY ( maize  OR  corn  OR  rice  OR  soybean  OR  soya  OR  rapeseed  OR  potato )

Appling selection criteria:

One reviewer performed the selection of the studies, which fulfil the inclusion criteria at three stages. At first, articles are selected by their title to remove highly irrelevant studies from the overall search results, followed by the second stage in which the inclusion criteria are applied against the abstracts of the articles. In the third stage, the articles are reviewed in full text for the presence of each of the elements needed for the inclusion.

Data extraction:

Details about the performed experiment were extracted from the "Materials and Methods" section of the papers, while the measurements of productivity and health parameters were extracted from the tables and graphs as provided by the authors in standardized data extraction sheet. Check for errors was performed on 20% subset of randomly selected records.

The following data extraction sheet was used:

Attribute

Definition

Type

Animal

Name of the animal

Characters

Gender

Name of the gender of the animals

Characters

Group_number

Number of animals in one group

Number

N

Total number of animals

Number

GM_crop

Name of the crop

Characters

GM_trait

Name of the GM trait

Characters

Inserted_gene

Name of the inserted gene

Characters

GM_event

Name of the GM event

Characters

Feed_type

Name of the type of feed

Characters

GM_content_in_the_feed

Percentage of GM material in the feed

Number and characters

Duration

Period in which animals have been fed with GM feed

Number and characters

Type_of_parameter

Name of the group of parameters: Growth and weight gain; Health; Productivity

Characters

Name_of_the_parameter

Name of the measured parameter

Characters

Measurement_units

Unit in which the measurement is presented

Characters

Non_GM_treatment

Value of the measured parameter for control non-GM treatment

Number

GM_treatment

Value of the measured parameter for GM treatment

Number

SD_or_SEM_measure

Variance

Characters

GM_treatment_SD_or_SEM

Value of the variance for control non-GM treatment

Number

Non-GM_treatment_SD_or_SEM

Value of the variance for GM treatment

Number

Statistical_difference

The statistical difference as stated by the authors

Characters

Remarks

Any additional information regarding the current record

Characters

Short_Reference

Short bibliographic reference

Characters

Source

Figure or table from which the measurement originates

Characters

Link_to_publication

Web link or DOI to the publication

Characters

Full_Reference

Full bibliographic reference

Characters

 

 

           

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