Responses in residual feed intake in lines of Large White pigs selected for growth rate on restricted feeding (measured on ad libitum individual feeding)

2005 ◽  
Vol 122 (4) ◽  
pp. 264-270 ◽  
Author(s):  
N.H. Nguyen ◽  
C.P. McPhee ◽  
C.M. Wade
Keyword(s):  
Growth Rate ◽  
Feed Intake ◽  
Residual Feed Intake ◽  
Restricted Feeding ◽  
Large White ◽  
Ad Libitum

Selection for lean growth in pigs with a restricted feeding regime

1994 ◽  
Vol 1994 ◽  
pp. 12-12
Author(s):  
M.K. Curran ◽  
N.D. Cameron ◽  
J.C. Kerr
Keyword(s):  
Growth Rate ◽  
Food Intake ◽  
Restricted Feeding ◽  
Correlated Responses ◽  
Large White ◽  
Daily Food Intake ◽  
Feeding Regime ◽  
Lean Growth ◽  
Daily Food ◽  
Ad Libitum

Divergent selection lines for lean growth on a restricted feeding regime, in Large White and Landrace pigs, were established to complement the lean growth selection lines on ad-libitum feeding. This study estimated the direct and correlated responses after four generations of selection and the corresponding genetic and phenotypic parameters.The selection objective for lean growth on restricted or scale (LGS) feeding was to obtain equal correlated responses in growth rate and carcass lean content, measured in phenotypic s.d. The selection criterion included measurements of growth rate and ultrasonic backfat depth.Large White (LW) and Landrace (LR) boars and gilts were purchased from eight British nucleus herds and boars from national artificial insemination centres in 1982. Homozygous or heterozygous halothane positive pigs were not included in the experiment. The base populations consisted of 31 LW and 19 LR sires and 57 LW and 67 LR dams. Within each population, there were high and low selection lines with a control line, each consisting of 10 boars and 20 gilts, with a generation interval of 13.5 and 12 months for LW and LR pigs. Animals were performance tested in individual pens from 30±3 kg for a period of 84 days and fed a high energy (13.8 MJ DE/kg DM) and high protein (210 g/kg DM crude protein) pelleted ration. Daily food intake was equal to 0.75 g/g of the daily food intake for ad-libitum fed pigs and the total food intake was 134 kg for LW pigs and 150 kg for LR pigs. On average, 3 boars and 3 gilts were tested per litter. The total number of pigs tested per line and average inbreeding coefficients at generation four, by population are given below.

scholarly journals PSII-34 Comparison of the activity level of high and low residual feed intake beef steers

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 217-217
Author(s):  
Sheyenne M Augenstein ◽  
Emily M Andreini ◽  
James W Oltjen ◽  
Roberto Sainz
Keyword(s):  
Feed Intake ◽  
Residual Feed Intake ◽  
Activity Level ◽  
Beef Steers ◽  
Restricted Feeding ◽  
Nutritional Conditions ◽  
The Mean ◽  
Ad Libitum ◽  
The Right ◽  
Ad Libitum Feeding

Abstract Activity level may affect residual feed intake (RFI), and cattle that move more may have less energy for gain. We compared activity level in high and low RFI beef steers under different nutritional conditions. Lying time, lying duration and lying bouts were recorded at 1-minute intervals utilizing Hobo G Pendant Loggers attached to the right hind leg. To identify RFI classification, 57 Angus-cross steers were individually housed and offered ad libitum access to a TMR for 56 d. RFI was defined as the residual of the regression of DMI on mid-test BW0.75 and ADG. High and low RFI groups (14 steers each) were defined as > 0.5 SD above or below the mean of zero, respectively. Ad libitum feeding was followed by restricted feeding at 75% of previous ad libitum DMI/BW0.75. After 56 d ad libitum feeding, steers were moved to group pens, ad libitum fed 4 days (ADLIBFED), then fasted 4 days (ADLIBFASTED). This was followed by the 56 d individual restricted feeding, after which, steers were moved to group pens, fed 4 days of restricted DMI (RESTRICTFED), then fasted 4 days (RESTRICTFASTED). There was no difference in lying time (800 and 804 minutes/day, P = 0.85), lying bouts per day (9.8 and 11.4, P = 0.16) and lying duration (99 and 84 minutes/bout, P = 0.18) between low RFI and high RFI cattle, respectively. Fasted animals had less lying time each day (P < 0.05), manifested by fewer lying bouts per day (P < 0.05), that tended (P > 0.05) to be slightly longer than fed animals. Ad lib animals tended (P > 0.05) to have less lying time each day, with a similar number of lying bouts per day, that were slightly (P > 0.05) shorter than restricted animals. Although activity is not affected by RFI level, results suggest that periods of limited feed availability increases activity level.

Performance and Carcass Composition of Yorkshire Pigs Selected for Low Residual Feed Intake under Ad Libitum and Restricted Feeding

2010 ◽  
Author(s):  
Nick Boddicker ◽  
Nicholas K. Gabler ◽  
Michael E. Spurlock ◽  
Daniel S. Nettleton ◽  
Jack C.M. Dekkers
Keyword(s):  
Feed Intake ◽  
Residual Feed Intake ◽  
Carcass Composition ◽  
Restricted Feeding ◽  
Yorkshire Pigs ◽  
Ad Libitum

scholarly journals Performance of Yorkshire Pigs Selected for Low Residual Feed Intake under Ad Libitum and Restricted Feeding

2009 ◽  
Author(s):  
Nick Boddicker ◽  
Nicholas K. Gabler ◽  
Michael E. Spurlock ◽  
Daniel S. Nettleton ◽  
Jack C.M. Dekkers
Keyword(s):  
Feed Intake ◽  
Residual Feed Intake ◽  
Restricted Feeding ◽  
Yorkshire Pigs ◽  
Ad Libitum

scholarly journals PSXI-6 Calculating energy efficiency use for Nellore bulls divergent in residual feed intake

2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 393-394
Author(s):  
Camila D A Batalha ◽  
Fabiana L De Araújo ◽  
Renata H Branco ◽  
Luis O Tedeschi ◽  
Sarah F Bonilha
Keyword(s):  
Energy Efficiency ◽  
Feed Intake ◽  
Subcutaneous Fat ◽  
Residual Feed Intake ◽  
Efficiency Index ◽  
Least Square ◽  
Metabolic Energy ◽  
Energetic Efficiency ◽  
Base Line ◽  
Ad Libitum

Abstract Retained energy (RE) and energetic efficiency index were measured in Nellore bulls from divergent classes of residual feed intake (RFI). Thirty-four Nellore bulls (15 low RFI-LRFI and 19 high RFI-HRFI) were feedlot finished and slaughtered with 385 ± 40 kg of body weight (BW) and 520 ± 26.2 days of age. At the beginning of the experiment, five LRFI and three HRFI were slaughtered and used as base line. Individual dry matter intake was recorded daily; initial and final BW were recorded after 16 h of fasting. Eight bulls, four LRFI and four HRFI, were fed at maintenance, receiving 65 g of DM/kg0.75 BW, and 18 bulls (10 LRFI and eight HRFI) were fed ad libitum. Diet had 19:81 roughage:concentrate, 88% of DM and 15% of crude protein. Ultrasound measurements on the Longissimus muscle were performed at intervals of 28 days. When two ad libitum bulls reached 4 mm of subcutaneous fat thickness, one maintenance bull was randomly chosen and slaughtered on the same day. After slaughter, the centesimal composition of the empty body and carcass was measured. Data were analyzed using a random coefficients model, and RFI class was included as a fixed effect. Least-square means were used to compare the means, and significance was declared for P ≤ 0.05. The LRFI had greater protein retention than HRFI (248 vs. 142 g/d; P = 0.009), and same fat and energy retention (313 g/d and 4.12 Mcal/d, respectively). The energy efficiency indexes, heat production per metabolic energy intake (Mcal/Mcal) and gain-to-feed (kg/kg) ratio, did not differ between RFI classes. Though LRFI had the same energy efficiency index, they were leaner. These results indicated an association of RFI and maturity patterns. Further research is needed to estimate the net energy requirements of Nellore bulls classified according to RFI. Acknowledgments: FAPESP Processes 2017/06709-2, 2018/20080–2 and 2019/17714-2.

Lactational performance, nursing and maternal behavior of Upton-Meishan and Large White sows

2001 ◽  
Vol 81 (4) ◽  
pp. 487-493 ◽  
Author(s):  
C. Farmer ◽  
M. F. Palin ◽  
M. T. Sorensen ◽  
S. Robert
Keyword(s):  
Growth Rate ◽  
Milk Yield ◽  
Milk Sample ◽  
Maternal Behavior ◽  
Feed Intake ◽  
Energy Content ◽  
Large White ◽  
Lactational Performance ◽  
Daily Milk Yield ◽  
Daily Milk

The growth of litters from 19 Upton-Meishan (UM) and 16 Large White (LW) sows was recorded from birth to weaning (25 d of age). Water and feed intake of sows were recorded. Suckling behavior was studied on days 5 and 20 of lactation. Milk yield was measured on day 22 and a milk sample was obtained the next day. Water intakes were similar (P = 0.947) for both breeds, yet UM sows consumed less feed throughout lactation (P = 0.0002). Average piglet (P < 0.05) and total litter (P < 0.001) weights were greater as of day 7 in UM compared to LW sows. Mean piglet weight on day 24 was 6.13 ± 0.16 kg for UM litters and 5.33 ± 0.33 kg for LW litters. Suckling interval was similar for UM and LW litters on day 5 (P = 0.533), but was shorter for UM litters on day 20 (41.4 ± 1.2 vs. 48.3 ± 2.8 min; P= 0.060). On day 22, daily milk yield corrected for actual suckling interval was greater (10.59 ± 0.47 vs. 8.03 ± 0.65 kg; P = 0.003) in UM sows. Milk from UM sows contained more fat (P= 0.042) and lactose (P = 0.005). In conclusion, the greater growth rate of piglets from UM sows is mainly due to a higher frequency of nursings and to greater energy content of milk. Key words: Sows, lactation, breed, Meishan, behavior, nursing

Genetic components of growth and ultrasonic fat depth traits in Meishan and Large White pigs and their reciprocal crosses

1992 ◽  
Vol 54 (1) ◽  
pp. 105-115 ◽  
Author(s):  
C. S. Haley ◽  
E. d'Agaro ◽  
M. Ellis
Keyword(s):  
Growth Rate ◽  
Food Intake ◽  
Performance Test ◽  
Subcutaneous Fat ◽  
Additive Effect ◽  
Food Conversion ◽  
Large White ◽  
Male And Female ◽  
Ad Libitum ◽  
The Impact

AbstractGenes from the Chinese Meishan pig have the potential to enhance reproductive performance of European pigs. In order to allow prediction of the impact of Meishan genes in a range of alternative improvement programmes all traits of economic importance must be evaluated and genetic crossbreeding effects estimated. Entire male and female pigs of four genotypes, purebred Meishan (MS) and Large White (LW) pigs and both reciprocal Fl crossbred genotypes (MS ♂ × LW ♀ and LW ♂ × MS ♀), were farrowed in Edinburgh and subsequently performance tested at either Edinburgh or Newcastle. In Edinburgh, animals were penned in groups of four and fed ad libitum between pen mean weights of approximately 30 and 80 kg. At the end of test fat depths at the shoulder, last rib and loin were measured ultrasonically. In Newcastle, animals were penned in groups of six and fed ad libitum between pen mean weights of approximately 30 and 70 kg. Genotypic means and genetic crossbreeding effects (additive and heterosis direct effects and additive maternal effects) were estimated using restricted maximum likelihood.When compared with the LW, the direct additive effect of genes from the MS produced increased growth rate up to the time of weaning, no change in growth rate between weaning and start of test and greatly reduced growth rate during the performance test. The maternal additive effect of genes from the MS was to reduce growth rate up to the time of weaning, with little effect thereafter. There was substantial direct heterosis for growth rate in all periods measured, but heterosis was less in males than in females during the performance test. The combined effect was such that, within sex, the LW and the two crossbred genotypes were of similar ages when they reached 70 and 80 kg, but MS pigs were 38 to 60 days older. The direct additive effect of MS genes was to increase subcutaneous fat levels and there was little evidence for the effects of maternal genes or direct heterosis on these traits. There was a direct additive effect of MS genes reducing food intake and increasing food conversion ratio and there was direct heterosis for increased food intake. There were significant interactions between genotype and sex. Male and female LW pigs had a similar performance but male MS pigs had slower growth rates on the performance test with lower food intakes, food conversion ratios and subcutaneous fat levels than the females.

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