Evidence map›Paper›PMID 42474896›Full record

ArticleTropical animal health and production2026

Selection index efficiency and genetic merit for age at first service and calving traits in friesian cows in Egypt.

Ibrahim Atta Abu El-Naser, Hassan Ghazy El-Awady, Weal Abdel-Menaem El-Hamady, Abdullah Ali Ghazy

Abstract read
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In one paragraph

Article in Tropical animal health and production, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

0numbers the graph read from it
0cells of the map it votes in
0citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

0 citing papers in PubMed.

No citing paper in PubMed yet.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors.

Ibrahim Atta Abu El-NaserDepartment of Animal, Poultry and Fish Production, Faculty of Agriculture, Damietta University, New Damietta City, Egypt.ORCID http://orcid.org/0000-0002-1777-1405
Hassan Ghazy El-AwadyAnimal Production Department, Faculty of Agriculture, Kafrelsheikh University, Kafrelsheikh, 33516, Egypt.ORCID http://orcid.org/0009-0005-2567-1235
Weal Abdel-Menaem El-HamadyAnimal Production Research Institute (ARRI), Agricultural Research Center (ARC), Dokki, Egypt.ORCID http://orcid.org/0000-0001-6098-6682
Abdullah Ali GhazyDepartment of Animal Production, Faculty of Agriculture, Suez Canal University, Ismailia, 41522, Egypt. ghazy@agr.suez.edu.eg.ORCID http://orcid.org/0000-0002-9594-4666

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

This study aimed to improve the efficiency of selection for productive and reproductive traits in Friesian cows under Egyptian conditions using 2,693 first-lactation records collected from Sakha and El-Karada farms. Restricted Maximum Likelihood (REML) procedures were used to estimate the (co)variance components for first lactation milk yield (FLMY), first lactation length (FLL), first lactation days open (FDO), age at first service (AFS), and age at first calving (AFC). A multi-trait animal model was applied to construct sixteen selection indices differing in trait combinations. Index accuracy (R

Indexed as

BreedingLactationReproductionSelection, GeneticAnimalsCattleDairyingEgyptFemaleMilkAccuracyAge at first calvingAge at first serviceFriesian cowsSelection indices

Identifiers

PMID42474896

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.