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=== 2000  Effect of Chemical Composition of Alfalfa Hay on Several . Digestive Measurements in Growing Rabbits" by Rosa Carabaño===
=== 2000  Effect of Chemical Composition of Alfalfa Hay on Several . Digestive Measurements in Growing Rabbits" by Rosa Carabaño===
EFFECT OF CHEMICAL COMPOSITION OF ALFALFA HAY ON SEVERAL DIGESTIVE MEASUREMENTS IN GROWING RABBITS
J. Garcia, c. de Blas, R. Carabafio, and P. Garcia
DEPARTAMENTO DE PRODUCCION ANIMAL, E.T.S.I. AGRONOMOS,
UNIVERSIDAD POLITECNICA, 28040 MADRID, SPAIN
Abstract:
Seventy five New Zealand White x Californian rabbits were used to study the influence of chemical composition of alfalfa hay on caecal and cecotrophy characteristics in growing rabbits. Five alfalfa hays were selected varying from 387 to 550 g NDF/kg DM and 35.2 to 27.0 g N/kg DM. Caecum, caecal contents and whole digestive tract weight (%bodyweight) and caecal NDF increased linearly (P=0.001) with the NDF content of diet. This fact implied the impairment of carcass performance when increased the fibre of diet. A linear decrease with NDF content of diet was observed for caecal N (P=0.001) and ammonia concentration ( P=O. 024) , the lowest value of ammonia concentration being 15.4 mg N-NH3/100 ml. A quadratic tendency (P=0.062) of type of diet was observed for the total VFA content, the extreme diets having the highest concentrations (as average 87.9 mmol/1). Caecal pH (as average 5.76) and VFA molar proportions (as average 79.3, 6.6 and 14.1% for acetic, propionic and butyric acid respectively) did not vary with type of diet. Total and microbial nitrogen content of soft faeces decreased linearly with dietary NDF (P=0.001).
Soft faeces of alfalfa A showed the highest value of total and microbial nitrogen ( 5. 2 and 2 .1%, respectively). Contribution of soft faeces to DM intake was not affected by type of diet, whereas contribution to N intake were quadratically influenced by diet, having alfalfas A and Ethe highest values ( as average 22. 9%) . It can be concluded that the variation on chemical composition of alfalfa hays produce a change in variables that indicate fermentation characteristics such as caecal ammonia, VFA and microbial nitrogen concentration. However, this changes do not affect the caecal pH value.
Key Words: Alfalfa hay, rabbits, caecum, caecotrophy.
https://www.academia.edu/keypass/VldVYTkrN3FQVmVjZzBlT0tPSXFNN3lJWks5a0JDbSs2Nm0vWk5yNTAvZz0tLThQaE85MTc3Vlo2YmdwVSsrTFpJdWc9PQ==--90cc8df7accb7e7757b217e27490b7698e7cf5a0/t/sPPdN-Qa9cnMB-B2d8N/resource/work/24812249/Effect_of_Chemical_Composition_of_Alfalfa_Hay_on_Several_Digestive_Measurements_in_Growing_Rabbits?email_work_card=title
https://www.academia.edu/keypass/VldVYTkrN3FQVmVjZzBlT0tPSXFNN3lJWks5a0JDbSs2Nm0vWk5yNTAvZz0tLThQaE85MTc3Vlo2YmdwVSsrTFpJdWc9PQ==--90cc8df7accb7e7757b217e27490b7698e7cf5a0/t/sPPdN-Qa9cnMB-B2d8N/resource/work/24812249/Effect_of_Chemical_Composition_of_Alfalfa_Hay_on_Several_Digestive_Measurements_in_Growing_Rabbits?email_work_card=title


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