Effects of forage quality and particle size on feed intake and ruminoreticulum content of goats

被引:0
|
作者
Lopes, Daniel Souza [1 ]
Rodrigues, Marcelo Teixeira [2 ]
de Oliveira, Tadeu Silva [3 ]
机构
[1] Inst Fed Educ Ciencia & Tecnol Sudeste Minas Gerai, BR-36180000 Rio Pomba, Brazil
[2] Univ Fed Vicosa, Dept Anim Sci, BR-36570000 Vicosa, Brazil
[3] Univ Estadual Norte Fluminense, Lab Anim Sci, BR-28013602 Campos Dos Goytacazes, Brazil
关键词
animal behavior; fiber quality; rumen content; selectivity; PHYSICALLY EFFECTIVE FIBER; DIETARY FIBER; RUMINAL FERMENTATION; CHEWING ACTIVITY; DAIRY; RUMEN; DIGESTIBILITY; RETENTION; DIGESTION; MILK;
D O I
10.1093/tas/txad101
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
The aim was to evaluate the effect of particle size and hay quality on feed intake, granulometric profile, and composition of the ruminoreticulum content in goats. We used 54 Alpine bucks in a completely randomized design with a factorial arrangement of 3 x 3. Treatments were a combination of Bermuda grass hay (Cynodon dactylon) with three quality levels: high (35 days), medium (50 days), and low (65 d) harvested at regrowth times. Were evaluated three particle sizes: small (16% >= 4.76 mm), medium (48% >= 4.76 mm), and large (75% >= 4.76 mm), which accounted for 66%, 75%, and 94% of physically effective fiber, respectively. Samples of offered diet, intake, and ruminoreticulum content were used to generate the granulometric profile. The offered diet, intake, and ruminoreticulum content presented different granulometric profiles regarding hay quality and particle size. Dry matter intake (DMI) and neutral detergent fiber intake (NDFI) increased (P < 0.05) when low-quality hay and large particles were offered. However, when particle size in low-quality hay was reduced, DMI and NDF decreased (P < 0.05). When analyzing the ruminoreticulum content (DM, NDF, peNDF, and indigestible DM), we did not observe any effect (P > 0.05) of hay quality or particle size on the variables. Thus, reducing hay quality and increasing particle size increase dry matter and fiber intake, presenting an interaction between forage quality and particle size. Forage quality and particle size promote intense selective behavior and chewing, which leads to a homogeneous content of particle profile in ruminoreticulum and a uniform average retention time.
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页数:7
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