+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Moderate decreases in the forage-to-concentrate ratio before feed restriction and increases thereafter independently improve the recovery from a feed restriction insult in beef cattle

Moderate decreases in the forage-to-concentrate ratio before feed restriction and increases thereafter independently improve the recovery from a feed restriction insult in beef cattle

Journal of Animal Science 91(10): 4739-4749

The objective of this study was to determine if the forage-to-concentrate ratio (F:C) of diets fed prior to and during (PRE) feed restriction (FR) and diets fed post-FR (POST) affect the recovery for DMI, ruminal fermentation, and short-chain fatty acid (SCFA) absorption following FR. Twenty ovariectomized and ruminally cannulated Angus × Hereford heifers were used in this study and were fed (ad libitum) either a high forage (HF; F:C = 92:8) or a moderate forage (MF; F:C = 60:40) diet for 19 d. Heifers were then exposed to a 5-d FR period where feed was restricted to 25% of ad libitum intake relative to that measured during the previous 5 d. After FR, heifers were provided feed ad libitum with one half of the HF and MF heifers receiving the HF or MF diet during the 3-wk recovery period (REC1, REC2, and REC3). This resulted in 4 treatment combinations separated over time (PRE-POST): HF-HF, HF-MF, MF-HF, and MF-MF. The PRE × POST interaction was not significant for any of the measured variables, and the PRE × POST × period interaction was only significant for the molar proportion of ruminal butyrate. For heifers fed HF PRE, DMI increased from REC1 to REC3 whereas DMI did not differ among periods for heifers fed MF PRE (PRE × period, P = 0.045). The duration that pH < 5.5 (PRE × POST; P = 0.003) was numerically greater during REC1 for heifers fed HF than MF PRE (191 vs. 98 min/d), with duration decreasing from REC1 to REC2 for heifers fed HF PRE. Total ruminal SCFA concentration and absorption rate were not affected by the diet fed PRE (P > 0.05) or period (P > 0.05). For heifers fed MF POST, DMI increased from REC1 to REC3 whereas DMI did not differ among POST periods for heifers fed HF POST (POST × period, P = 0.033). The duration that ruminal pH was <5.5 was greater for heifers fed MF than HF POST (274.9 vs. 14.1 min/d; POST × period, P < 0.001) with MF heifers decreasing duration from REC1 to REC2 whereas duration did not differ among periods for HF. Ruminal SCFA concentration and rate of absorption were not affected (P > 0.05) by diet fed POST. It is concluded that feeding a MF diet prior to and during FR improves the recovery response for DMI. Irrespective of the prefeeding, however, a HF diet is beneficial in the POST-restriction period because it most effectively alleviated ruminal pH reduction and hastened DMI recovery.

Please choose payment method:

(PDF emailed within 0-6 h: $19.90)

Accession: 054419087

Download citation: RISBibTeXText

PMID: 23942712

DOI: 10.2527/jas.2012-6224

Related references

Effects of forage or concentrate diets and intake during and after feed restriction on growth, composition, and energy expenditure of beef steers. Aguilera, J F EAAP Publication; Energy metabolism of farm animals 257-260, 1994

Changes in feed intake, growth, feed efficiency, and body composition of beef cattle fed forage then concentrate diets. Journal of Animal Science 95: 64-64, 2017

The effect of differing forage: Concentrate ratio and restricting feed intake on the energy and nitrogen utilization by beef cattle. Livestock Production Science 51(1-3): 151-164, 1997

Growth performance, feed digestibility, body composition, and feeding behavior of high- and low-residual feed intake fat-tailed lambs under moderate feed restriction. Journal of Animal Science 94(8): 3382-3388, 2016

Recovery of absorptive function of the reticulo-rumen and total tract barrier function in beef cattle after short-term feed restriction. Journal of Animal Science 91(4): 1696-1706, 2013

Restriction of the commercial mixed feed in rations for beef cattle. Zeszyty problemowe postepow nauk rolniczych: 57) 139-143, 1984

Effects of monensin and forage:concentrate ratio on feed intake, endocrine, and ovarian function in beef heifers. Animal Reproduction Science 67(3-4): 171-180, 2001

Effect of early feed restriction in male broiler chicks on plasma metabolic hormones during feed restriction and accelerated growth. Comparative Biochemistry and Physiology A 91(1): 67-70, 1988

Early feed restriction, a tool to improve the feed efficiency in broilers. Pakistan Journal of Biological Sciences 9(6): 1178-1180, 2006

Feed restriction to improve feed efficiency in chickens and turkeys. 1989

Studies on feed restriction of layer. 1. Effect of feed restriction on performance of layers. Japanese Poultry Science 13(6): 235-242, 1976

Divergent selection for postweaning feed conversion in beef cattle predicted response based on an index of feed intake and gain vs feed gain ratio. Journal of Animal Science 65(Suppl. 1): 195, 1987

Temporal feed restriction and overstocking increase competition for feed by dairy cattle. Journal of Dairy Science 94(11): 5480-5486, 2011

Short-term feed restriction decreases the systemic and intrafollicular concentrations of leptin and increases the vascularity of the preovulatory follicle in mares. Theriogenology 73(9): 1202-1209, 2010

Residual feed intake of Angus beef cattle divergently selected for feed conversion ratio. Livestock Science 132(1-3): 41-47, 2010