NUTRITIONAL AND PHYSIOLOGICAL STUDIES ON FRIES1AN CALVES FED PROTECTED FAT AND PROTEIN DIETS: 6. HISTOLOGICAL AND HISTOMETRIC CHARACTERiSTICS OF THE RUMEN | ||||
| Journal of Animal and Poultry Production | ||||
| Article 4, Volume 31, Issue 12, December 2006, Page 7561-7578 PDF (334.06 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2006.235671 | ||||
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| Authors | ||||
| A. E. Abdel-Khalek,1; M . A. Abdelhamid1; A. F. Mehrez2; E. A. Omar2; M. A. Abu EIHamd2 | ||||
| 1Anim. Prod. Dept., Fac. Agric.1 Mansoura University. | ||||
| 2Anim. Prod. Research Institute, Agric. Res. Center, Egypt | ||||
| Abstract | ||||
| A total of 18 Friesian calves having one month of age was used in 3 dietary treatment groups to study the effect of feeding protected protein or protected fat diets, from 1 up to B months of age, on histological characteristics of the rumen of Friesian calves. The 1 group (control) was fed untreated concentrate feed mixture (CFM), the was fed CFM, 5% of it was replaced by protected fat (PF) and the 3 was fed CFM treated with 1% formaldehyde on the basìs of its total CP (PP). All groups were fed plus berseem hay beside the CFM. Thickness of all ruminai wall tunicae, mucosal lamìnae and stratum (st.) corneum was estimated. Also, density and dimensions of ruminai papillae were measured to calculate papillary surface area. Results indicated that tunica mucosa was thicker (Pc0.05) in PP than in PF and control groups. Thickness of lamina epithelialis mucosa (LEM) did not differ significantly among treatment groups. However, it was thicker (P’0.O5) in PF than ¡n PP group (0.30 vs. 0.27 mm). As overall mean, st. corneum tended to be thicker ¡n control (44.3 pm) than in PF (42.9 pm) and PP (43.2 sim) group. Lamina propria was thicker (P<005) in PP than ¡n PF and control groups (1.20 vs. 0.96 and 1.02 mm). Subrriucosa was thicker (P<0.05) in PF and PP groups than in control group. Total thickness of tunica musculosa was higher (P’cO.05) ¡n PP and PP than ¡n control group. Generaly, thickness of all previous traits varied significantly between different ruminai sacs as affected significantly by dietary treatments. Ventral ruminai sac showed significantly the highest thickness in calves of all groups. Papillary length was affected (P’cO.05) by dietary treatment, but each of PF or PP group did not differ significantly from that of the control one. Papillary length ¡n was shorter (P<0.05) in PP than in PP group. Treatment group did not affect papillary width. Density of papiHae was lower (PcO.05) in PF and PP groups than in control one. Surface area of each papilla was lower (Pc005) in PF than in PP and control groups, which did not differ significantly. Papillary surface area per cm2 was lower (P<O.05) in PF group; however, PP group < br /> showed in9nificantly [ower values compared with the control. Inter-papillary surface area per cm showed negative relationship with papillary density and was significantly affected by dietary treatments, ruminai sac and their interaction. Total surface area per cm of different ruminai sacs mainly affected by surface area of papillae within each cm2. So, total surface area/cm2 showed the same trend of surface area of papillaelcm2 as affected by dietary treatment and ruminai sacs. On the basis on the foregoing results, it could be conclude from the nutritional point of view that feeding calves on the tested diets esuIted had beneftcìat effects on histological and histometric characteristics of rumen of Friesiari calves during suckling period and arly post-weaning ages. | ||||
| Keywords | ||||
| Histological; rumen; calves; protected protein; protected fat | ||||
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