Effects of limestone particle size and dietary available Phosphorus (AP) contents on performance, eggshell quality and mineral excretion in laying hens
Küçük Resim Yok
Tarih
2013
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
ECOLE NATIONALE VETERINAIRE TOULOUSE
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The study was conducted in order to determine the influence of the limestone particle size and the available phosphorus (AP) contents in layer diets on performance, eggshell quality and mineral excretions. For that, 108 Hy-Line W36, 25 weeks old, were randomly allotted in 9 experimental groups according to the limestone particle size (fine (< 2 mm), medium (2-5 mm) and large (> 5 mm)) and to the AP contents (0.44, 0.55 and 0.66%) in diets distributed for 12 weeks. Performances (body weight, egg weight, egg production, egg mass, feed intake and food efficiency), eggshell qualities such as resistance, thickness, weight and mineral (Ca, P and Mg) accumulation) and mineral excretion were evaluated at the end of the experiment. The particle size and dietary AP content as main factors had no significant effect on food efficiency, egg weight, eggshell qualities and P and Mg eggshell accumulation. However, large particles have significantly decreased the egg production and mass, feed intake and the eggshell Ca amount but have significantly increased the Mg excretion. With 0.44% AP in diet, feed intake and Ca excretion were significantly depressed while eggshell Ca accumulation was enhanced and with 0.66% AP, the P excretion was markedly augmented. Considering interactions between the 2 factors, it was observed that maximal egg weight was obtained with fine particles associated with 0.44% AP and also with medium particles and 0.66% AP or large particles and 0.44% AP but with the 2 last regimens, feed intake, eggshell weight or resistance and Ca excretion were negatively affected in parallel, whereas Ca accumulation in eggshell was also amplified with fine particles and 0.44% AP. These results showed that fine limestone particles coupled to 0.44% AP in diets was the optimal combination for sustaining performance, egg production and qualities and limiting mineral excretion in laying hens.
Açıklama
Anahtar Kelimeler
Laying hens, particle size, calcium, available phosphorus, performance, egg production, eggshell quality, mineral eggshell content, mineral excretion
Kaynak
REVUE DE MEDECINE VETERINAIRE
WoS Q Değeri
Q4
Scopus Q Değeri
Q3
Cilt
164
Sayı
10
