NOTE: This item is not available outside the Texas A&M University network. Texas A&M affiliated users who are off campus can access the item through NetID and password authentication or by using TAMU VPN. Non-affiliated individuals should request a copy through their local library's interlibrary loan service.
Effect of level of fish meal on intake and performance in calves grazing sorghum
MetadataShow full item record
Effect of five concentrations of fish meal (FM 0, 9, 27, 45 and 630-. of DM) in .91 kg/d of a supplement was evaluated in thirty-five Brahman-European cross calves (avg BW=160 + 20 kg). Supplements were formulated with rice mill feed, molasses, and FM to have equal concentration of calcium, phosphorus and adequate trace minerals. All animals rotationally grazed successive 1.25 ha strips of sorghum pasture for 62 days. Animals were individually penned for 45 min/d and offered their assigned supplement. Two markers (samarium and ytterbium nitrate) were used to estimate individual fecal output (FO) and indigestible neutral detergent fiber content of feces and esophageal masticate was used to estimate digestibility. Esophageal masticate of four cannulated steers contained 12. 60-. crude protein, 7 7 . 3 O-. neutral detergent fiber (NDF) and 25-. indigestible NDF. The FO (g/kg BW) and forage organic matter intake were positively .07 respectively) related (P < .001 and P = .07 respectively) supplement intake protein (SIP, g/kg BW) while to daily digestible forage organic matter and potentially digestible fiber as well as daily gains were unrelated. Fecal crude protein excreted (FCP, g/kg BW) and concentration (g/kg fecal OM) were positively correlated (P = .0001 and P = .0001 respectively) with SIP. Although level of SIP was significantly related to intake and FO, the R' were relatively small (<.30) whereas the R' for FCP concentration was relatively large (>.80) . The relationship between SIP and FCP (FCP = .61 + .63 SIP) indicated that 63% of SIP was truly undigested if metabolic fecal crude protein (MFCP) was constant at .61 g/kg BW. Regression of apparently digested intake protein (g/kg OMI) vs intake protein (IP, g/kg OMI), yielded a poor fit. A model of constant slopes (true digestibility) and multiple intercepts (MFCP) appeared appropriate. Fitting the data to such a model yielded estimates of slope of .92 (SE = .18) with intercepts varying from-11 to-52 g/kg OMI. The relationship between MFCP so estimated and mean total intake protein (TIP) by level of SIP was : MFCP =-39.18 + .79 TIP. Thus, in this experiment, each unit increase in TIP was associated with an increased loss of .79 units of MFCP. Possible biological reasons for this relations between TIP and MFCP are discussed.
DescriptionDue to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to firstname.lastname@example.org, referencing the URI of the item.
Includes bibliographical references.
Scaglia Alonso, Guillermo (1994). Effect of level of fish meal on intake and performance in calves grazing sorghum. Master's thesis, Texas A&M University. Available electronically from
Request Open Access
This item and its contents are restricted. If this is your thesis or dissertation, you can make it open-access. This will allow all visitors to view the contents of the thesis.